add docker cache and tag image

.forgejo/workflows/deploy.yaml

@@ -17,6 +17,14 @@ jobs:
       - uses: actions/checkout@v4
       - name: docker build
         run: docker build -t nseguin42/website:latest .
+      - uses: actions/cache@v2
+        with:
+          path: /var/lib/docker
+          key: ${{ runner.os }}-docker-${{ hashFiles('**/Dockerfile') }}
+          restore-keys: |
+            ${{ runner.os }}-docker-
+      - name: docker tag
+        run: docker tag nseguin42/website:latest nseguin42/website:${{ github.sha }}
       - name: docker login
         run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
       - name: docker push