NOISSUE - Create and publish a Docker image (#29)

* Create and publish a Docker image

This commit adds a new file `.github/workflows/build.yml` which contains the workflow configuration for creating and publishing a Docker image. The workflow is triggered on push events to the `main` branch. It sets environment variables for the registry and image name. The job runs on `ubuntu-latest` and has necessary permissions for reading contents and writing packages. The steps include checking out the repository, logging in to the container registry using the GitHub token, and extracting metadata for Docker.

Signed-off-by: SammyOina <sammyoina@gmail.com>

* Refactor build workflow and update Makefile

The build workflow has been refactored to build the Manager image instead of the API Gateway image. The Makefile has also been updated.

The changes include:
- Renaming the build step to "Build Manager and push Docker image"
- Updating the image name to include "/manager"
- Updating the build arguments to use "SVC=manager"
- Updating the tags to use the output from the metadata action

These changes ensure that the correct Docker image is built and pushed.

Signed-off-by: SammyOina <sammyoina@gmail.com>

* remove labels

Signed-off-by: SammyOina <sammyoina@gmail.com>

---------

Signed-off-by: SammyOina <sammyoina@gmail.com>

.github/workflows/build.yml

@@ -0,0 +1,47 @@
+# Copyright (c) Ultraviolet
+# SPDX-License-Identifier: Apache-2.0
+
+name: Create and publish a Docker image
+
+on:
+  push:
+    branches: ["main"]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}/manager
+
+      - name: Build Manager and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./docker/Dockerfile
+          push: true
+          build-args: |
+            SVC=manager
+          tags: ${{ steps.meta.outputs.tags }}