Build docker container on push to main

.github/workflows/main.yaml

@@ -0,0 +1,49 @@
+name: Publish the web application's container to Docker Hub for deploying on servers.
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - 
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      -       
+        name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+      -     
+        name: Cache Docker layers
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+      - 
+        uses: docker/login-action@v1 
+        with:
+          username: ${{ secrets.DOCKER_UNAME }}
+          password: ${{ secrets.DOCKER_TOKEN }}
+      -
+        name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: ./ 
+          platforms: linux/amd64,linux/arm64
+          file: ./Dockerfile
+          builder: ${{ steps.buildx.outputs.name }}
+          push: true
+          tags: nalinangrish/bost-portal:latest
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache
+      -
+        name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}