add workflows that automate docker builds against merge group events

.github/workflows/docker-build-backend-container-on-merge-group.yml

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+name: Build Backend Image on Merge Group
+
+on:
+  pull_request:
+    branches: [ "main" ]
+  merge_group:
+    types: [checks_requested]
+
+env:
+  REGISTRY_IMAGE: danswer/danswer-backend
+
+jobs:
+  build:
+    # for EE, run on special image-builders runners
+    # TODO: make this a matrix build like the web containers
+    runs-on: 
+      group: amd64-image-builders
+      
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
+    - name: Backend Image Docker Build
+      uses: docker/build-push-action@v5
+      with:
+        context: ./backend
+        file: ./backend/Dockerfile
+        platforms: linux/amd64,linux/arm64
+        push: false
+        tags: |
+          ${{ env.REGISTRY_IMAGE }}:latest
+        build-args: |
+          DANSWER_VERSION=v0.0.1

.github/workflows/docker-build-web-container-on-merge-group.yml

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+name: Build Web Image on Merge Group
+
+on:
+  pull_request:
+    branches: [ "main" ]
+  merge_group:
+    types: [checks_requested]
+
+env:
+  REGISTRY_IMAGE: danswer/danswer-web-server
+
+jobs:
+  build:
+    runs-on: 
+      group: ${{ matrix.platform == 'linux/amd64' && 'amd64-image-builders' || 'arm64-image-builders' }}
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - linux/amd64
+          - linux/arm64
+
+    steps:
+      - name: Prepare
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV          
+      
+      - name: Checkout
+        uses: actions/checkout@v4
+      
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY_IMAGE }}
+          tags: |
+            type=raw,value=${{ env.REGISTRY_IMAGE }}:latest
+      
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+    
+      - name: Build by digest
+        id: build
+        uses: docker/build-push-action@v5
+        with:
+          context: ./web
+          file: ./web/Dockerfile
+          platforms: ${{ matrix.platform }}
+          push: false
+          build-args: |
+            DANSWER_VERSION=v0.0.1
+          # needed due to weird interactions with the builds for different platforms  
+          no-cache: true
+          labels: ${{ steps.meta.outputs.labels }}