fix forgejo actions: use gitea.com action URLs and fix sha syntax

.forgejo/workflows/docker.yml

@@ -13,27 +13,19 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: https://gitea.com/actions/checkout@v4
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
+        uses: https://gitea.com/docker/setup-qemu-action@v3
         with:
           platforms: all
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: https://gitea.com/docker/setup-buildx-action@v3
-
-      - name: Build Docker image
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          push: false
-          tags: kv-download:latest
-          platforms: linux/amd64,linux/arm64
 
       - name: Login to Docker Registry
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@v3
+        uses: https://gitea.com/docker/login-action@v3
         with:
           registry: git.khoavo.myds.me
           username: ${{ secrets.DOCKER_USERNAME }}
@@ -41,11 +33,20 @@ jobs:
 
       - name: Build and Push Docker image
         if: github.event_name != 'pull_request'
-        uses: docker/build-push-action@v6
+        uses: https://gitea.com/docker/build-push-action@v6
         with:
           context: .
           push: true
           tags: |
             git.khoavo.myds.me/vndangkhoa/kv-download:latest
-            git.khoavo.myds.me/vndangkhoa/kv-download:{{ sha }}
+            git.khoavo.myds.me/vndangkhoa/kv-download:${{ github.sha }}
+          platforms: linux/amd64,linux/arm64
+
+      - name: Build Docker image (PR only)
+        if: github.event_name == 'pull_request'
+        uses: https://gitea.com/docker/build-push-action@v6
+        with:
+          context: .
+          push: false
+          tags: kv-download:latest
           platforms: linux/amd64,linux/arm64