try caching ccache manually

.forgejo/workflows/test.yml

@@ -34,8 +34,13 @@ jobs:
             tcl-dev \
             z3 \
             zlib1g-dev \
-      - name: ccache
-        uses: https://github.com/hendrikmuhs/ccache-action@v1
+      - name: Cache ccache dir
+        uses: https://code.forgejo.org/actions/checkout@v3
+        with:
+          path: ~/.ccache
+          key: ${{ runner.os }}-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-
       - run: |
           export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
           echo "$PATH" >> "$GITHUB_PATH"