chore: configure dynamic image naming for frontend and backend in Docker workflow

- Added steps to dynamically set the image names for both frontend and backend based on the repository owner and name.
- Updated Docker build tags to use the newly configured image names instead of hardcoded values.

.gitea/workflows/docker.yml

@@ -16,6 +16,14 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Configure backend image name
+        shell: bash
+        run: |
+          set -euo pipefail
+          owner=$(echo "${{ gitea.repository }}" | cut -d/ -f1 | tr '[:upper:]' '[:lower:]')
+          name=$(echo "${{ gitea.repository }}" | cut -d/ -f2 | tr '[:upper:]' '[:lower:]')
+          echo "IMAGE_NAME=${{ env.REGISTRY }}/${owner}/${name}-backend" >> "${GITHUB_ENV}"
+
       - name: Prepare backend build context
         shell: bash
         run: |
@@ -50,8 +58,8 @@ jobs:
           platforms: linux/amd64
           push: true
           tags: |
-            ${{ env.REGISTRY }}/${{ gitea.repository }}:backend-latest
-            ${{ env.REGISTRY }}/${{ gitea.repository }}:backend-${{ gitea.sha }}
+            ${{ env.IMAGE_NAME }}:latest
+            ${{ env.IMAGE_NAME }}:${{ gitea.sha }}
           cache-from: type=gha,scope=backend
           cache-to: type=gha,mode=max,scope=backend
           labels: |
@@ -67,6 +75,14 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Configure frontend image name
+        shell: bash
+        run: |
+          set -euo pipefail
+          owner=$(echo "${{ gitea.repository }}" | cut -d/ -f1 | tr '[:upper:]' '[:lower:]')
+          name=$(echo "${{ gitea.repository }}" | cut -d/ -f2 | tr '[:upper:]' '[:lower:]')
+          echo "IMAGE_NAME=${{ env.REGISTRY }}/${owner}/${name}-frontend" >> "${GITHUB_ENV}"
+
       - name: Prepare frontend build context
         shell: bash
         run: |
@@ -107,8 +123,8 @@ jobs:
           platforms: linux/amd64
           push: true
           tags: |
-            ${{ env.REGISTRY }}/${{ gitea.repository }}:frontend-latest
-            ${{ env.REGISTRY }}/${{ gitea.repository }}:frontend-${{ gitea.sha }}
+            ${{ env.IMAGE_NAME }}:latest
+            ${{ env.IMAGE_NAME }}:${{ gitea.sha }}
           cache-from: type=gha,scope=frontend
           cache-to: type=gha,mode=max,scope=frontend
           labels: |