chore: Add release workflow

.dockerignore

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+node_modules
+coldmfa/app/node_modules
+public/coldmfa
+compose

.github/workflows/release.yaml

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+name: Release
+
+on:
+  create:
+    tags:
+      - v*
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+      attestations: write
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
+      - name: Generate artifact attestation
+        uses: actions/attest-build-provenance@v1
+        with:
+          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}
+          subject-digest: ${{ steps.push.outputs.digest }}
+          push-to-registry: true
+
+

Dockerfile

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+FROM golang:1.22-alpine AS builder
+
+WORKDIR /locus
+
+COPY go.mod go.sum ./
+
+RUN go mod download
+
+RUN apk update && apk add --update nodejs npm
+
+COPY locus.go ./
+COPY public public
+COPY auth auth
+COPY coldmfa coldmfa
+
+WORKDIR /locus/coldmfa/app
+RUN npm ci && npm run build
+
+WORKDIR /locus
+
+RUN go build
+
+FROM alpine:latest
+
+WORKDIR /app
+
+COPY --from=builder /locus/locus /app/locus
+
+EXPOSE 3000
+
+CMD ["/app/locus"]