chore: multi-arch Docker build (amd64, arm64, armv7) (#4)

* chore: multi-arch Docker build (amd64, arm64, armv7)

- Remove hardcoded GOARCH=amd64 from Dockerfile, use TARGETARCH ARG
- Add QEMU + buildx to CI for cross-compilation
- Build for linux/amd64, linux/arm64, linux/arm/v7

* chore: update action versions, add dependabot

- actions/checkout v4 → v6
- actions/setup-go v5 → v6
- Add dependabot.yml (monthly checks for Go, Actions, Docker)

.github/dependabot.yml

@@ -0,0 +1,41 @@
+version: 2
+updates:
+  # Go modules
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    labels:
+      - "dependencies"
+    commit-message:
+      prefix: "chore(deps)"
+    groups:
+      go-dependencies:
+        patterns:
+          - "*"
+
+  # GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    labels:
+      - "dependencies"
+      - "ci"
+    commit-message:
+      prefix: "chore(ci)"
+    groups:
+      actions-dependencies:
+        patterns:
+          - "*"
+
+  # Docker
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    labels:
+      - "dependencies"
+      - "docker"
+    commit-message:
+      prefix: "chore(docker)"

.github/workflows/ci.yml

@@ -10,9 +10,9 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
           go-version-file: go.mod
 
@@ -30,7 +30,11 @@ jobs:
       contents: read
       packages: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
+
+      - uses: docker/setup-qemu-action@v3
+
+      - uses: docker/setup-buildx-action@v3
 
       - uses: docker/login-action@v3
         with:
@@ -42,4 +46,5 @@ jobs:
         with:
           context: .
           push: true
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           tags: ghcr.io/turbootzz/vaultwarden-api:latest

Dockerfile

@@ -8,7 +8,10 @@ COPY go.mod go.sum ./
 RUN go mod download
 COPY . .
 
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
+ARG TARGETOS=linux
+ARG TARGETARCH=amd64
+
+RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build \
     -ldflags="-s -w" \
     -o /build/vaultwarden-api \
     ./cmd/api