[WIFI-2882] Add: image build and cleanup workflow

.github/workflows/build.yml

@@ -0,0 +1,53 @@
+name: Build Docker image
+
+on:
+  push:
+    paths-ignore:
+      - '**.md'
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  docker:
+    runs-on: ubuntu-20.04
+    env:
+      DOCKER_REGISTRY_URL: tip-tip-wlan-cloud-ucentral.jfrog.io
+      DOCKER_REGISTRY_USERNAME: ucentral
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Build Docker image
+      run: docker build -t wlan-cloud-ucentralgw-ui:${{ github.sha }} .
+
+    - name: Log into Docker registry
+      uses: docker/login-action@v1
+      with:
+        registry: ${{ env.DOCKER_REGISTRY_URL }}
+        username: ${{ env.DOCKER_REGISTRY_USERNAME }}
+        password: ${{ secrets.DOCKER_REGISTRY_PASSWORD }}
+
+    - name: Push Docker image
+      run: |
+        TAGS="${{ github.sha }}"
+
+        if [ ${GITHUB_REF} == "refs/heads/main" ]
+        then
+          TAGS="$TAGS ${GITHUB_REF#refs/heads/}"
+        else # PR build
+          CURRENT_TAG=$(echo ${GITHUB_HEAD_REF#refs/heads/} | tr '/' '-')
+          TAGS="$TAGS $CURRENT_TAG"
+        fi
+
+        echo "Pushing tags $TAGS"
+
+        for tag in $TAGS; do
+          docker tag wlan-cloud-ucentralgw-ui:${{ github.sha }} ${{ env.DOCKER_REGISTRY_URL }}/ucentralgw-ui:$tag
+          docker push ${{ env.DOCKER_REGISTRY_URL }}/ucentralgw-ui:$tag
+        done

.github/workflows/cleanup.yml

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+name: Clean up PR Docker images
+
+on:
+  pull_request:
+    branches:
+      - main
+    types: [ closed ]
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    steps:
+      - run: |
+          export PR_BRANCH_TAG=$(echo ${GITHUB_HEAD_REF#refs/heads/} | tr '/' '-')
+          curl -uucentral:${{ secrets.DOCKER_REGISTRY_PASSWORD }} -X DELETE "https://tip.jfrog.io/artifactory/tip-wlan-cloud-ucentral/ucentralgw-ui/$PR_BRANCH_TAG"