fix actions

.gitea/actions/build/action.yml

@@ -0,0 +1,36 @@
+name: Build docker image
+description: 'builds docker image'
+
+inputs:
+  tag:
+    description: 'Docker image tag'
+    required: true
+
+outputs:
+  image_url:
+    description: 'Full image URL that was built'
+    value: ${{ steps.build.outputs.image_url }}
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Set up Docker Build
+      uses: docker/setup-buildx-action@v3
+
+    - name: Log in to registry
+      uses: docker/login-action@v3
+      with:
+        registry: ${{ vars.INSTANCE_URL }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.REGISTRY_ACCESS_TOKEN }}
+
+    - name: Build and push image
+      uses: docker/build-push-action@v6
+      with:
+        push: true
+        tags: ${{ vars.INSTANCE_URL }}/tech-reborn/phoenix:${{ inputs.tag }}
+
+    - name: Set output
+      shell: bash
+      run: |
+        echo "image_url=${{ vars.INSTANCE_URL }}/tech-reborn/phoenix:${{ inputs.tag }}" >> $GITHUB_OUTPUT