add github workflows for building the docker image

.github/README.md

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+# CI/CD
+
+Since we're hosting our source code on GitHub, we'll leverage GitHub Actions to automate our CI/CD pipeline.
+
+GitHub's pipelines are written in YAML files and located within a special directory called `.github`. This directory
+contains two subdirectories, [workflows and actions](https://docs.github.com/en/actions/learn-github-actions/understanding-github-actions).
+Which are used to define the CI/CD pipeline and to create custom actions, respectively.
+
+## Workflows
+
+### [check-docker-build.yaml](./workflows/check-docker-build.yaml)
+
+This workflow runs on every pull request and checks if the Docker image can be built successfully. It's a good practice
+to check if the Docker image can be built before merging the pull request to the `main` branch.
+
+We'll leverage the following reusable actions from GitHub's marketplace to build the image.
+
+- [docker/build-push-action](https://github.com/docker/build-push-action): Builds and pushes the Docker image.
+
+### [publish-docker-image.yaml](./workflows/publish-docker-image.yaml)
+
+This workflow is triggered when a new commit is pushed to the `main` branch. It builds the Docker image and pushes it
+to the Container Registry. In our case, we'll use the [GitHub Container Registry](https://docs.github.com/en/packages/guides/about-github-container-registry)
+and the [Docker Hub Container Registry](https://www.docker.com/products/docker-hub/) as examples.
+
+We'll leverage the following reusable actions from GitHub's marketplace to build and push the image.
+
+- [docker/login-action](https://github.com/docker/login-action): For authenticating with the Docker Hub and the GitHub Container Registry.
+  Make sure to provide the right credentials to authenticate with your registry.
+- [docker/metadata-action](https://github.com/docker/metadata-action): Extracts metadata from the Docker image.
+- [docker/build-push-action](https://github.com/docker/build-push-action): Builds and pushes the Docker image.
+

.github/workflows/check-docker-build.yaml

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+name: "Check Docker build"
+on:
+  pull_request: {}
+
+jobs:
+  build:
+    name: "Build docker image"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v4
+
+      - name: "Docker build"
+        uses: docker/build-push-action@v5
+        with:
+          context: ./my-awesome-app
+          push: false
+          tags: my-awesome-app:latest

.github/workflows/publish-docker-image.yaml

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+name: "Publish Docker image"
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  publish:
+    name: "Build and publish Docker image"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v4
+
+      - name: "Login to Docker Hub"
+        uses: docker/login-action@v3
+        with:
+          username: fernandoarteaga
+          password: ${{ secrets.FERNANDO_DOCKER_HUB_TOKEN }}
+
+      - name: "Login to GitHub Container Registry"
+        uses: docker/login-action@v3
+        with:
+          registry: "ghcr.io"
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: "Extract metadata (tags, labels) for Docker"
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            fernandoarteaga/${{ inputs.image-name }}
+            ghcr.io/${{ github.repository }}/${{ inputs.image-name }}
+          flavor: |
+            latest=auto
+          tags: |
+            type=sha
+            # set latest tag for main branch
+            type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', 'main') }}
+
+      - name: "Build and push Docker images"
+        uses: docker/build-push-action@v5
+        with:
+          context: ./my-awesome-app
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}