ci: parametrize build and push for fork portability

Hardcoded references to tecnativa/postgres-autoconf and the upstream
repo prevented forks from building and publishing their own images.

Replace with dynamic values:
- hooks/build reads DOCKER_REPO from environment (with fallback)
- CI uses github.repository_owner for repo and GITHUB_TOKEN for GHCR
- Drop Docker Hub push (requires manual secrets setup)
- Only push on master branch to ghcr.io

This enables any fork to build, test, and publish images to GHCR
without additional secret configuration.

Author: yajo

.github/workflows/ci.yaml

@@ -44,7 +44,7 @@ jobs:
     env:
       # Indicates what's the equivalent to tecnativa/postgres-autoconf:latest image
       LATEST_RELEASE: "18-alpine"
-      DOCKER_REPO: tecnativa/postgres-autoconf
+      DOCKER_REPO: ${{ github.repository_owner }}/postgres-autoconf
       DOCKER_TAG: ${{ matrix.pg_version }}-alpine
       GIT_SHA1: ${{ github.sha }}
       IS_PR: ${{ github.event_name == 'pull_request' }}
@@ -67,18 +67,11 @@ jobs:
       - name: Tag Docker Image for PR
         if: env.IS_PR
         run: docker tag ${{ env.DOCKER_REPO }}:${{ matrix.pg_version }}-alpine ${{ env.DOCKER_REPO }}:${{ env.DOCKER_TAG }}
-      # Push
-      - name: Push Docker Image to Docker Hub
-        if: github.repository == 'Tecnativa/docker-postgres-autoconf' && (github.ref == 'refs/heads/master' || (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository))
-        env:
-          REGISTRY_HOST: docker.io
-          REGISTRY_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
-          REGISTRY_USERNAME: ${{ secrets.DOCKERHUB_LOGIN }}
-        run: ./hooks/push
-      - name: Push Docker Image to GitHub Registry
-        if: github.repository == 'Tecnativa/docker-postgres-autoconf' && (github.ref == 'refs/heads/master' || (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository))
+      # Push to GitHub Container Registry
+      - name: Push Docker Image to GitHub Container Registry
+        if: github.ref == 'refs/heads/master'
         env:
           REGISTRY_HOST: ghcr.io
-          REGISTRY_TOKEN: ${{ secrets.BOT_TOKEN }}
-          REGISTRY_USERNAME: ${{ secrets.BOT_LOGIN }}
+          REGISTRY_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          REGISTRY_USERNAME: ${{ github.actor }}
         run: ./hooks/push

hooks/build

@@ -3,6 +3,7 @@ from plumbum import FG, local
 from plumbum.cmd import date, docker
 
 # Check environment variables are present
+DOCKER_REPO = local.env.get("DOCKER_REPO", "tecnativa/postgres-autoconf")
 DOCKER_TAG = local.env["DOCKER_TAG"]
 COMMIT = local.env.get("GIT_SHA1")
 DATE = date("--rfc-3339", "ns")
@@ -19,7 +20,7 @@ DATE = date("--rfc-3339", "ns")
         "--build-arg",
         "BASE_TAG={}".format(DOCKER_TAG),
         "--tag",
-        "tecnativa/postgres-autoconf:{}".format(DOCKER_TAG),
+        "{}:{}".format(DOCKER_REPO, DOCKER_TAG),
         ".",
     ]
     & FG