add dockerfile. (initia-labs#19)

* add dockerfile.

* clean up.

* change workdir

* expose opinitd directly

* update comments and remove unused copy line

---------

Co-authored-by: beer-1 <[email protected]>

.github/workflows/docker.yml

@@ -0,0 +1,63 @@
+name: Docker
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - "main"
+    tags:
+      - "v*"
+    paths:
+      - "**.go"
+      - "go.mod"
+      - "go.sum"
+  pull_request:
+    branches:
+      - "main"
+    paths:
+      - "**.go"
+      - "go.mod"
+      - "go.sum"
+
+env:
+  REGISTRY: ghcr.io
+
+jobs:
+  opinitd:
+    name: opinitd
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    outputs:
+      tags: ${{ steps.meta.outputs.tags }}
+
+    env:
+      IMAGE_NAME: opinitd
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          file: Dockerfile
+          push: ${{ startsWith(github.ref, 'refs/tags') }} # push image only for tags
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -0,0 +1,19 @@
+# Used for running OPinit bots in a Docker container
+# 
+# Useage: 
+#  $ docker build --tag opinit-bots .
+
+FROM golang:1.23-alpine AS builder
+
+RUN apk add --no-cache g++ make bash
+
+WORKDIR /app
+COPY . /app/
+
+RUN make install
+
+FROM alpine:latest
+
+COPY --from=builder /go/bin/opinitd /usr/local/bin/
+
+ENTRYPOINT ["/usr/local/bin/opinitd"]