ci: force save cache (#2738)

Author: vladopajic

.github/workflows/test_all.yml

@@ -164,7 +164,9 @@ jobs:
         uses: actions/cache/restore@v5
         with:
           path: nimcache
-          key: nimcache-test_all-${{ matrix.platform.os }}-${{ matrix.platform.cpu }}-${{ matrix.platform.cc }}-${{ matrix.nim.ref }}-${{ matrix.nim.memory_management }}
+          key: nimcache-test_all-${{ matrix.platform.os }}-${{ matrix.platform.cpu }}-${{ matrix.platform.cc }}-${{ matrix.nim.ref }}-${{ matrix.nim.memory_management }}-${{ github.run_id }}
+          restore-keys: |
+            nimcache-test_all-${{ matrix.platform.os }}-${{ matrix.platform.cpu }}-${{ matrix.platform.cc }}-${{ matrix.nim.ref }}-${{ matrix.nim.memory_management }}
 
       - name: Build test_all
         id: build-test-all
@@ -193,6 +195,17 @@ jobs:
           path: nimcache
           key: ${{ steps.nimcache-restore.outputs.cache-primary-key }}
 
+      - name: Prune old nimcache entries
+        if: github.ref_name == 'master'
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          PREFIX="nimcache-test_all-${{ matrix.platform.os }}-${{ matrix.platform.cpu }}-${{ matrix.platform.cc }}-${{ matrix.nim.ref }}-${{ matrix.nim.memory_management }}"
+          KEEP="${{ steps.nimcache-restore.outputs.cache-primary-key }}"
+          gh cache list --ref "${{ github.ref }}" --limit 100 --json id,key \
+            --jq ".[] | select(.key | startswith(\"$PREFIX\")) | select(.key != \"$KEEP\") | .id" \
+            | xargs -r -n1 gh cache delete
+
       - name: Run tests
         id: run-tests
         run: |