Auto clean ccache to not grow it forever. (#42302)

* Auto clean ccache to not grow it forever.

* Add conditional.

* Fix condition a bit.

Author: andy31415

.github/workflows/tests.yaml

@@ -433,6 +433,9 @@ jobs:
                   path: objdir-clone/
                   # objdirs are big; don't hold on to them too long.
                   retention-days: 5
+            - name: Ensure only useful ccache is kept
+              if: github.ref == 'refs/heads/master' && env.DISABLE_CCACHE != 'true'
+              run: ccache --evict-older-than 1d || true
             - name: Delete existing ccache before save
               if: github.ref == 'refs/heads/master' && env.DISABLE_CCACHE != 'true'
               uses: ./.github/actions/delete-cache
@@ -598,6 +601,9 @@ jobs:
                   path: objdir-clone/
                   # objdirs are big; don't hold on to them too long.
                   retention-days: 5
+            - name: Ensure only useful ccache is kept
+              if: github.ref == 'refs/heads/master' && env.DISABLE_CCACHE != 'true'
+              run: ccache --evict-older-than 1d || true
             - name: Delete existing ccache before save
               if: github.ref == 'refs/heads/master' && env.DISABLE_CCACHE != 'true'
               uses: ./.github/actions/delete-cache
@@ -849,7 +855,9 @@ jobs:
                 retention-days: 2
                 if-no-files-found: error
                 overwrite: true
-
+            - name: Ensure only useful ccache is kept
+              if: github.ref == 'refs/heads/master' && env.DISABLE_CCACHE != 'true'
+              run: ccache --evict-older-than 1d || true
             - name: Delete existing ccache before save
               if: github.ref == 'refs/heads/master' && env.DISABLE_CCACHE != 'true'
               uses: ./.github/actions/delete-cache