Add GitHub Actions workflow for build and publish

This workflow builds and publishes the Scrutiny Omnibus image to the GitHub Container Registry when changes are pushed to the master branch or manually triggered.

Author: Starosdev

.github/workflows/build-and-publish.yml

@@ -0,0 +1,42 @@
+name: Build & Publish Scrutiny Omnibus Image
+
+on:
+  push:
+    branches: [ master ]
+    paths:
+      - 'docker/**'
+      - 'webapp/**'
+      - 'collector/**'
+      - 'go.mod'
+      - 'go.sum'
+      - 'example.scrutiny.yaml'
+      - 'example.collector.yaml'
+  workflow_dispatch:
+
+jobs:
+  build-and-push-omnibus:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build & push omnibus image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: docker/omnibus/Dockerfile
+          push: true
+          tags: |
+            ghcr.io/${{ github.repository_owner }}/scrutiny:omnibus
+            ghcr.io/${{ github.repository_owner }}/scrutiny:latest