Added build workflow

.gitea/workflows/build.yaml

@@ -0,0 +1,61 @@
+name: Build
+run-name: Build Docker Image
+on: [push, pull_request]
+
+jobs:
+
+  runs-on: ubuntu-latest
+
+  steps:
+    - name: Set up Docker Buildx
+      uses: crazy-max/ghaction-docker-buildx@v1
+
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Prepare Docker build
+      id: prepare
+      run: |
+        function version { echo "$@" | awk -F. '{ printf("%d%03d%03d%03d\n", $1,$2,$3,$4); }'; }
+
+        BITCOIN_VERSION='24'
+        LATEST_BITCOIN_MAJOR_VERSION=$(find . -type d -maxdepth 1 -not -path '*/\.*' | sort -n | tail -n 1 | cut -c 3-)
+        PLATFORMS="linux/amd64"
+        PUSH=false
+        TAGS='bill/bitcoin-docker:24'
+
+        echo ::set-output name=build_date::$(date -u +'%Y-%m-%dT%H:%M:%SZ')
+        echo ::set-output name=docker_platforms::${PLATFORMS}
+        echo ::set-output name=docker_username::${{ gitea.repository_owner }}
+        echo ::set-output name=push::${PUSH}
+        echo ::set-output name=tags::${TAGS}
+        echo ::set-output name=build::true
+
+    - if: ${{ steps.prepare.outputs.build }} == 'true'
+      name: Login into Registry
+      uses: docker/login-action@v3
+      with:
+        username: ${{ gitea.repository_owner }}
+        password: ${{ secrets.REGISTRY_TOKEN }}
+
+    - if: ${{ steps.prepare.outputs.build }} == 'true'
+      name: Build Docker image
+      run: |
+        TAGS=(${{ steps.prepare.outputs.tags }})
+
+        echo "Build date: ${{ steps.prepare.outputs.build_date }}"
+        echo "Docker platform: ${{ steps.prepare.outputs.docker_platforms }}"
+        echo "Push: ${{ steps.prepare.outputs.push }}"
+        echo "Tags: ${{ steps.prepare.outputs.tags }}"
+
+        echo docker buildx build --platform ${{ steps.prepare.outputs.docker_platforms }} \
+          --output "type=image,push=${{steps.prepare.outputs.push}}" \
+          --progress=plain \
+          --build-arg "BUILD_DATE=${{ steps.prepare.outputs.build_date }}" \
+          $(printf "%s" "${TAGS[@]/#/ --tag }" )/
+
+        docker buildx build --platform ${{ steps.prepare.outputs.docker_platforms }} \
+          --output "type=image,push=${{steps.prepare.outputs.push}}" \
+          --progress=plain \
+          --build-arg "BUILD_DATE=${{ steps.prepare.outputs.build_date }}" \
+          $(printf "%s" "${TAGS[@]/#/ --tag }" )/