Auto-push of nginx-keycloak's Docker image on main (#9)

* Auto push of the docker build

* Pushing only on main

* Pushing only on main

.github/workflows/docker-build.yml

@@ -0,0 +1,31 @@
+name: Docker build of nginx-keycloak
+
+on: [push]
+
+jobs:
+
+  docker-build:
+    name: Ubuntu 22.04 build of nginx-keycloak
+    runs-on: ubuntu-22.04
+
+    steps:
+
+      - name: Check Out Repo 
+        uses: actions/checkout@v2
+
+      - name: Docker-compose build
+        run: |
+          docker compose build
+      
+      - name: Log in to GitHub Container Registry
+        if: github.ref == 'refs/heads/main'
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Push nginx image to GitHub Container Registry
+        if: github.ref == 'refs/heads/main'
+        run: |
+          docker push ghcr.io/flavienbwk/nginx-keycloak/nginx-sso:$(grep -oP "(?<=image: ghcr.io/flavienbwk/nginx-keycloak/nginx-sso:).*" docker-compose.yml)

README.md

@@ -1,6 +1,6 @@
 # Nginx Keycloak
 
-[![Docker build](https://github.com/flavienbwk/nginx-keycloak/actions/workflows/linux-build.yml/badge.svg)](https://github.com/flavienbwk/nginx-keycloak/actions/workflows/linux-build.yml)
+[![Docker build](https://github.com/flavienbwk/nginx-keycloak/actions/workflows/docker-build.yml/badge.svg)](https://github.com/flavienbwk/nginx-keycloak/actions/workflows/docker-build.yml)
 [![Test](https://github.com/flavienbwk/nginx-keycloak/actions/workflows/test-keycloak-setup.yml/badge.svg)](https://github.com/flavienbwk/nginx-keycloak/actions/workflows/test-keycloak-setup.yml)
 
 Setting NGINX as a reverse proxy with Keycloak SSO in front of your web applications.