Add CI workflow to build and push container images

Introduced a GitHub Actions workflow to automate building and pushing
container images for the API and Blazor projects. The workflow triggers
on `push` events to the `develop` branch and includes the following:

- Configured permissions for `contents: read` and `packages: write`.
- Added a `build-and-push` job running on `ubuntu-latest`.
- Steps include:
  - Checkout repository code using `actions/checkout@v4`.
  - Setup .NET SDK version `10.0.x` using `actions/setup-dotnet@v4`.
  - Log in to GitHub Container Registry (GHCR) using `GITHUB_TOKEN`.
  - Build and publish container images for API and Blazor projects.
  - Push the container images to GHCR.

This workflow ensures the latest container images are built and stored
in the registry for the `develop` branch.

Author: iammukeshm

.github/workflows/build-and-push-containers.yml

@@ -0,0 +1,53 @@
+name: Build and push API & Blazor containers
+
+on:
+  push:
+    branches:
+      - develop
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup .NET SDK
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '10.0.x'
+
+      - name: Log in to GitHub Container Registry
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u "${{ github.actor }}" --password-stdin
+
+      - name: Publish API container image
+        run: |
+          dotnet publish src/Playground/Playground.Api/Playground.Api.csproj \
+            -c Release -r linux-x64 \
+            -p:PublishProfile=DefaultContainer \
+            -p:ContainerRegistry=ghcr.io \
+            -p:ContainerRepository=${{ github.repository_owner }}/fsh-playground-api \
+            -p:ContainerImageTag=${{ github.sha }}
+
+      - name: Publish Blazor container image
+        run: |
+          dotnet publish src/Playground/Playground.Blazor/Playground.Blazor.csproj \
+            -c Release -r linux-x64 \
+            -p:PublishProfile=DefaultContainer \
+            -p:ContainerRegistry=ghcr.io \
+            -p:ContainerRepository=${{ github.repository_owner }}/fsh-playground-blazor \
+            -p:ContainerImageTag=${{ github.sha }}
+
+      - name: Push API image to GHCR
+        run: |
+          docker push ghcr.io/${{ github.repository_owner }}/fsh-playground-api:${{ github.sha }}
+
+      - name: Push Blazor image to GHCR
+        run: |
+          docker push ghcr.io/${{ github.repository_owner }}/fsh-playground-blazor:${{ github.sha }}
+