use env variables instead of secret

.gitea/workflows/docker-build-push.yml

@@ -15,20 +15,24 @@ jobs:
           git clone "${{ gitea.server_url }}/${{ gitea.repository }}.git" .
           git checkout "${{ gitea.ref_name }}"
 
+      - name: Set image metadata
+        run: |
+          IMAGE_NAME="$(echo "${{ gitea.repository }}" | tr '[:upper:]' '[:lower:]' | tr '_' '-')"
+          IMAGE="${DOCKER_REGISTRY}/${DOCKER_USERNAME}/${IMAGE_NAME}:${{ gitea.ref_name }}"
+
+          echo "IMAGE_NAME=${IMAGE_NAME}" >> "$GITEA_ENV"
+          echo "IMAGE=${IMAGE}" >> "$GITEA_ENV"
+
       - name: Login to Docker Registry
         run: |
-          echo "${{ secrets.DOCKER_PASSWORD }}" | docker login "${{ secrets.DOCKER_REGISTRY }}" \
-            -u "${{ secrets.DOCKER_USERNAME }}" \
+          echo "$DOCKER_PASSWORD" | docker login "$DOCKER_REGISTRY" \
+            -u "$DOCKER_USERNAME" \
             --password-stdin
 
       - name: Build Docker Image
         run: |
-          IMAGE_NAME="$(echo "${{ gitea.repository }}" | tr '[:upper:]' '[:lower:]' | tr '_' '-')"
-          docker build \
-            -t "${{ secrets.DOCKER_REGISTRY }}/${IMAGE_NAME}:${{ gitea.ref_name }}" \
-            .
+          docker build -t "$IMAGE" .
 
       - name: Push Docker Image
         run: |
-          IMAGE_NAME="$(echo "${{ gitea.repository }}" | tr '[:upper:]' '[:lower:]' | tr '_' '-')"
-          docker push "${{ secrets.DOCKER_REGISTRY }}/${IMAGE_NAME}:${{ gitea.ref_name }}"
+          docker push "$IMAGE"