chore: Support Github Codespaces (#2510)

Note: Update the ruby version 2.7.3. For production Linux VM, install 2.7.3 and follow the upgrade steps as shown in https://www.chatwoot.com/docs/self-hosted/deployment/linux-vm#upgrading-to-a-newer-version-of-chatwoot

.github/workflows/publish_codespace_image.yml

@@ -0,0 +1,23 @@
+name: Publish Codespace Base Image
+
+on:
+  workflow_dispatch:
+
+jobs:
+  publish-code-space-image:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v1
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Build the Codespace Base Image
+      run: |
+        docker build . -t ghcr.io/chatwoot/chatwoot_codespace:latest -f .devcontainer/Dockerfile.base 
+        docker push ghcr.io/chatwoot/chatwoot_codespace:latest