Add workflows to build Mailroom images

.github/workflows/build-develop-india-mailroom.yaml

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+name: Build Develop India Mailroom
+on:
+  push:
+    branches:
+      - 'feature/build'
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    environment: 
+      name: develop-india
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v2
+        with:
+          ref:  feature/build
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Set output
+        id: vars
+        run: echo ::set-output name=tag::develop-v6.5.6
+      - name: Login to ECR
+        uses: docker/login-action@v1 
+        with:
+          registry: 242357350604.dkr.ecr.ap-south-1.amazonaws.com
+          username: ${{ secrets.AWS_ACCESS_KEY_ID }}
+          password: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+      - name: Build and push - Mailroom Image
+        id: docker_build1
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: docker/Dockerfile
+          push: true
+          tags: 242357350604.dkr.ecr.ap-south-1.amazonaws.com/mailroom:${{ steps.vars.outputs.tag }}
+          no-cache: true

.github/workflows/build-develop-ireland-mailroom.yaml

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+name: Build Develop Ireland Mailroom
+on:
+  push:
+    branches:
+      - 'feature/build'
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    environment: 
+      name: develop-ireland
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v2
+        with:
+          ref:  feature/build
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Set output
+        id: vars
+        run: echo ::set-output name=tag::develop-v6.5.6
+      - name: Login to ECR
+        uses: docker/login-action@v1 
+        with:
+          registry: 452158872079.dkr.ecr.eu-west-1.amazonaws.com
+          username: ${{ secrets.AWS_ACCESS_KEY_ID }}
+          password: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+      - name: Build and push - Mailroom Image
+        id: docker_build1
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: docker/Dockerfile
+          push: true
+          tags: 452158872079.dkr.ecr.eu-west-1.amazonaws.com/mailroom:${{ steps.vars.outputs.tag }}
+          no-cache: true