feat: add-gateway-build-to-the-ci

feat: add gw build to the ci
ACDC-124

.github/workflows/build-gateway

@@ -0,0 +1,102 @@
+name: build gateway
+
+on:
+  push:
+    branches:
+      - 'main'
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  code_gw_change:
+    # continue-on-error: true # Uncomment once integration is finished
+    runs-on: ubuntu-latest
+    # Map a step output to a job output
+    outputs:
+      should_skip: ${{ steps.skip_check.outputs.should_skip }}
+    steps:
+      - id: skip_check
+        uses: fkirc/skip-duplicate-actions@v3.4.0
+        with:
+          github_token: ${{ github.token }}
+          paths: '["code/gateway/**"]'
+          cancel_others: 'true'
+          do_not_skip: '["push", "workflow_dispatch"]'
+  docker_image:
+    runs-on: ubuntu-latest
+    outputs:
+      should_skip: ${{ steps.skip_check.outputs.should_skip }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install xmllint
+        run: sudo apt-get install libxml2-utils
+      - id: skip_check
+        run: |
+          if [[ $GITHUB_REF == refs/pull/* ]]; then
+            GW_EXISTS=false
+          else
+            pushd code
+            GW_EXISTS=$(make -s check-gw-image)
+            popd
+          fi
+          echo ::set-output name=should_skip::${GW_EXISTS}
+  build-gw:
+    needs:
+      - code_gw_change
+      - docker_image
+    if: ${{ needs.code_gw_change.outputs.should_skip != 'true' && needs.docker_image.outputs.should_skip != 'true' }}
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      - 
+        name: Install xmllint
+        run: sudo apt-get install libxml2-utils
+      -
+        name: Set up JDK
+        uses: actions/setup-java@v1
+        with:
+          java-version: '16'
+      -
+        name: Prepare
+        id: prep
+        run: |
+          PUSH=FALSE
+          if [[ $GITHUB_REF == refs/heads/* ]]; then
+            BRANCH_NAME=$(echo ${GITHUB_REF#refs/heads/} | sed -r 's#/+#-#g')
+            if [ "${{ github.event.repository.default_branch }}" = "$BRANCH_NAME" ]; then
+              PUSH=TRUE
+            fi
+          elif [[ $GITHUB_REF == refs/pull/* ]]; then
+            BRANCH_NAME=$(echo ${{ github.event.pull_request.head.ref }} | sed -r 's#/+#-#g')
+            if [[ $BRANCH_NAME == release-* ]]; then
+              PUSH=TRUE
+              SUFFIX=rc
+            else
+              SUFFIX=pr-${{ github.event.number }}
+            fi
+          fi
+          echo ::set-output name=push::${PUSH}
+          echo ::set-output name=suffix::${SUFFIX}
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Login to DockerHub
+        if: ${{ steps.prep.outputs.push == 'true' }}
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push
+        run: |
+          cd code
+          make build-gw SUFFIX=${{ steps.prep.outputs.suffix }} PUBLISH=${{ steps.prep.outputs.push }}
+