Changes CI config to GitHub Actions

.drone.yml

@@ -1,98 +0,0 @@
-kind: pipeline
-name: default
-
-#
-# Global definitions
-#
-
-# This CI uses a fork of docker/dind which also provides buildx support.
-.buildimage: &buildimage
-  image: maniator/dind-buildx
-
-# Environment setup.
-.env: &env
-  environment:
-    USERNAME:
-      from_secret: dockerhub_username
-    PASSWORD:
-      from_secret: dockerhub_password
-    REPO: maxkratz/postfix_exporter
-
-# Define a temporary volue for communicating with the dind service.
-.dockervolume: &dockervolume
-  volumes:
-    - name: dockersock
-      path: /var/run
-
-# Wait a bit for dind to start
-.sleep: &sleep
-  sleep 5
-
-# Login to dockerhub.
-.login: &login
-  docker login -u $USERNAME -p $PASSWORD
-
-# Setup the buildx builder.
-.setup: &setup
-  docker run --rm --privileged multiarch/qemu-user-static --reset -p yes && docker buildx create --name builder --driver docker-container --use && docker buildx inspect --bootstrap
-# ^normally, one would use a syntax like this:
-#.setup: &setup
-#  - docker ..
-#  - docker ..
-# BUT: The YAML parser of drone does not allow it and returns an error:
-# > cannot unmarshal !!seq into string
-# Therefore, the setup block uses && to run all three docker comands as one single string.
-#
-# Additionally, this command breaks if some newlines `\` are included.
-
-# Only build and push images if commit is on the branch `main`.
-.ismain: &ismain
-  when:
-    branch:
-      include:
-        - main
-
-# Only build(-only) images if commit is NOT on the branch `main`.
-.isnotmain: &isnotmain
-  when:
-    branch:
-      exclude:
-        - main
-
-steps:
-  # Build latest image without pushing it.
-  - name: build-latest
-    <<: *buildimage
-    <<: *dockervolume
-    <<: *env
-    commands:
-      - *sleep
-      - *setup
-      - docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 -t $REPO:latest .
-    <<: *isnotmain
-
-  # Build and push latest image.
-  - name: build-and-push-latest
-    <<: *buildimage
-    <<: *dockervolume
-    <<: *env
-    commands:
-      - *sleep
-      - *login
-      - *setup
-      - docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 -t $REPO:latest --push .
-    <<: *ismain
-
-#
-# Dind service for building Docker images.
-#
-services:
-  - name: docker
-    image: docker:dind
-    privileged: true
-    <<: *dockervolume
-
-# The temporary volume for the dockersocket.
-volumes:
-  - name: dockersock
-    temp: {}

.github/workflows/build.yml

@@ -0,0 +1,31 @@
+name: Build Docker images
+on:
+  push:
+    branches:
+      - 'main'
+      - 'testing/**'
+      - 'feature/**'
+      - 'hotfix/**'
+
+jobs:
+  build-latest:
+    runs-on: [ubuntu-22.04]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build latest
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          push: ${{ github.event_name == 'push' && contains(github.ref, 'refs/heads/main') && github.event_name != 'schedule' }}
+          tags: maxkratz/postfix_exporter:latest
+          platforms: linux/amd64,linux/arm64,linux/arm/v7