add hashes to artifacts

.gitea/workflows/build.yaml

@@ -11,7 +11,7 @@ jobs:
         uses: actions/cache@v3
         with:
           path: /opt/
-          key: marp-renderer
+          key: marp-renderer-${{ hashFiles('./.gitea/workflows/build.yaml') }}
       - name: checkout
         uses: actions/checkout@v4
       - name: install marp toolchain
@@ -24,7 +24,7 @@ jobs:
         uses: actions/cache/save@v3
         with:
           path: /opt/
-          key: marp-renderer
+          key: marp-renderer-${{ hashFiles('./.gitea/workflows/build.yaml') }}
       - name: build presentation
         working-directory: ./presentation
         run: |