add workflow for docker build

.dockerignore

@@ -1,2 +1,4 @@
 Dockerfile
 tgs.Dockerfile
+docs/
+README.md

.github/workflows/docker-publish.yml

@@ -0,0 +1,66 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - master
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Container Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: ${{ github.event_name == 'pull_request' && 'linux/amd64' || 'linux/amd64,linux/arm64' }}
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+

Dockerfile

@@ -1,9 +1,14 @@
-FROM alpine AS builder
+FROM golang:alpine AS builder
+
+# allow to cache the go mod download
+COPY go.mod go.sum ./
+RUN go mod download
 
 COPY . /go/src/matterbridge
-RUN apk --no-cache add go git \
-        && cd /go/src/matterbridge \
-        && CGO_ENABLED=0 go build -ldflags "-X github.com/matterbridge-org/matterbridge/version.GitHash=$(git log --pretty=format:'%h' -n 1)" -o /bin/matterbridge
+
+RUN apk --no-cache add git
+RUN cd /go/src/matterbridge && \
+    CGO_ENABLED=0 go build -ldflags "-X github.com/matterbridge-org/matterbridge/version.GitHash=$(git log --pretty=format:'%h' -n 1)" -o /bin/matterbridge
 
 FROM alpine
 RUN apk --no-cache add ca-certificates mailcap

changelog.md

@@ -23,6 +23,7 @@
   - matterbridge output now colors log level for easier log reading ([#25](https://github.com/matterbridge-org/matterbridge/pull/25))
   - new HTTP helpers are common to all bridges, and allow overriding specific settings ([#59](https://github.com/matterbridge-org/matterbridge/pull/59))
   - matterbridge is now built with whatsappmulti backend enabled by default
+  - Docker images are now automatically built and published to `ghcr.io/matterbridge-org/matterbridge` ([#86](https://github.com/matterbridge-org/matterbridge/pull/86))
 - mastodon
   - Add new Mastodon bridge ([#14](https://github.com/matterbridge-org/matterbridge/pull/14)/[#16](https://github.com/matterbridge-org/matterbridge/pull/16), thanks @lil5)
   - Supports public messages and private messages

docs/running.md

@@ -24,7 +24,7 @@ From the directory where you have your configuration `matterbridge.toml`, create
 version: '3.7'
 services:
   matterbridge:
-    image: 42wim/matterbridge:stable
+    image: ghcr.io/matterbridge-org/matterbridge:latest
     restart: unless-stopped
     volumes:
     - ./matterbridge.toml:/etc/matterbridge/matterbridge.toml:ro