Add CI/CD pipeline, GitHub Releases, and in-repo Docker support

.dockerignore

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+.git
+*.zip
+bin/
+build/
+.vs/
+*.sln
+*.user
+*.suo
+*.log
+*.bak
+*.DS_Store

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: ['**']
+    tags-ignore: ['v*']
+  pull_request:
+    branches: [master]
+
+jobs:
+  linux:
+    name: Linux (${{ matrix.platform }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: x86_64
+            compiler: gcc
+            packages: ''
+          - platform: aarch64
+            compiler: aarch64-linux-gnu-gcc
+            packages: gcc-aarch64-linux-gnu
+          - platform: arm
+            compiler: arm-linux-gnueabihf-gcc
+            packages: gcc-arm-linux-gnueabihf
+          - platform: armv6
+            compiler: arm-linux-gnueabi-gcc
+            packages: gcc-arm-linux-gnueabi
+          - platform: armv5
+            compiler: arm-linux-gnueabi-gcc
+            packages: gcc-arm-linux-gnueabi
+            cflags: '-march=armv5t -mfloat-abi=soft'
+          - platform: x86
+            compiler: i686-linux-gnu-gcc
+            packages: gcc-i686-linux-gnu
+          - platform: mips
+            compiler: mips-linux-gnu-gcc
+            packages: gcc-mips-linux-gnu
+            cflags: '-march=mips32'
+          - platform: mipsel
+            compiler: mipsel-linux-gnu-gcc
+            packages: gcc-mipsel-linux-gnu
+            cflags: '-march=mips32'
+          - platform: sparc64
+            compiler: sparc64-linux-gnu-gcc
+            packages: gcc-sparc64-linux-gnu
+            cflags: '-mcpu=v7'
+          - platform: powerpc
+            compiler: powerpc-linux-gnu-gcc
+            packages: gcc-powerpc-linux-gnu
+            cflags: '-m32'
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install cross-compiler
+        if: matrix.packages != ''
+        run: sudo apt-get install -y ${{ matrix.packages }}
+
+      - name: Build airupnp
+        working-directory: airupnp
+        run: make CC=${{ matrix.compiler }} HOST=linux PLATFORM=${{ matrix.platform }} CFLAGS="${{ matrix.cflags }}" -j$(nproc)
+
+      - name: Build aircast
+        working-directory: aircast
+        run: make CC=${{ matrix.compiler }} HOST=linux PLATFORM=${{ matrix.platform }} CFLAGS="${{ matrix.cflags }}" -j$(nproc)
+
+  macos:
+    name: macOS
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Build airupnp (arm64)
+        working-directory: airupnp
+        run: make CC=clang HOST=macos PLATFORM=arm64 -j$(sysctl -n hw.logicalcpu)
+
+      - name: Build aircast (arm64)
+        working-directory: aircast
+        run: make CC=clang HOST=macos PLATFORM=arm64 -j$(sysctl -n hw.logicalcpu)
+
+  windows:
+    name: Windows (Win32)
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - uses: ilammy/msvc-dev-cmd@v1
+
+      - name: Build airupnp and aircast
+        shell: pwsh
+        run: |
+          $bindir = "$env:GITHUB_WORKSPACE\bin"
+          New-Item -Force -ItemType Directory $bindir | Out-Null
+          msbuild airupnp/AirUPnP.vcxproj /p:Configuration=Release /p:Platform=Win32 /p:OutDir="$bindir\" /v:minimal
+          msbuild airupnp/AirUPnP.vcxproj /p:Configuration=Static  /p:Platform=Win32 /p:OutDir="$bindir\" /v:minimal
+          msbuild aircast/AirCast.vcxproj  /p:Configuration=Release /p:Platform=Win32 /p:OutDir="$bindir\" /v:minimal
+          msbuild aircast/AirCast.vcxproj  /p:Configuration=Static  /p:Platform=Win32 /p:OutDir="$bindir\" /v:minimal
+          Get-ChildItem "$bindir\*.exe"

.github/workflows/docker.yml

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+name: Docker
+
+on:
+  push:
+    tags: ['v*']
+  workflow_dispatch:
+    inputs:
+      push:
+        description: Push image to registry
+        type: boolean
+        default: false
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository_owner }}/airconnect
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build-push:
+    name: Build & Push (${{ matrix.platform }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: linux/amd64
+            artifact: amd64
+          - platform: linux/arm64
+            artifact: arm64
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: docker/Dockerfile
+          platforms: ${{ matrix.platform }}
+          labels: ${{ steps.meta.outputs.labels }}
+          outputs: type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }},push-by-digest=true,name-canonical=true,push=true
+          cache-from: type=gha,scope=${{ matrix.artifact }}
+          cache-to: type=gha,mode=max,scope=${{ matrix.artifact }}
+
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digest-${{ matrix.artifact }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    name: Create multi-arch manifest
+    needs: build-push
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digest-*
+          merge-multiple: true
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Create and push manifest
+        working-directory: /tmp/digests
+        run: |
+          docker buildx imagetools create \
+            $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf '${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@sha256:%s ' *)