ops: hashFiles workaround

https://docs.gitea.com/next/usage/actions/comparison#hashfiles-expression

.gitea/workflows/ci.yml

@@ -19,13 +19,19 @@ jobs:
       -
         name: Create docker cache folder
         run: mkdir -p /tmp/docker
+      -
+        name: Hash dockerfile
+        id: dockerfile-hash
+        uses: actions/go-hashfiles@v0.0.1
+        with:
+          patterns: builder.Dockerfile
       -
         name: Restore docker image
         id: cache-docker
         uses: actions/cache@v3
         with:
           path: /tmp/docker
-          key: ${{ runner.os }}-docker-${{ hashFiles('builder.Dockerfile') }}
+          key: ${{ runner.os }}-docker-${{ steps.dockerfile-hash.outputs.hash }}
       -
         name: Build docker builder-image
         if: steps.cache-docker.outputs.cache-hit != 'true'
@@ -42,13 +48,19 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: docker/setup-buildx-action@v2
+      -
+        name: Hash dockerfile
+        id: dockerfile-hash
+        uses: actions/go-hashfiles@v0.0.1
+        with:
+          patterns: builder.Dockerfile
       -
         name: Restore docker image
         id: cache-docker
         uses: actions/cache@v3
         with:
           path: /tmp/docker
-          key: ${{ runner.os }}-docker-${{ hashFiles('builder.Dockerfile') }}
+          key: ${{ runner.os }}-docker-${{ steps.dockerfile-hash.outputs.hash }}
       -
         name: Load image
         run: |