ci: move to GitHub Actions, add workflow for building and pushing docker images

.github/workflows/docker.yml

@@ -0,0 +1,46 @@
+name: Docker image build
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+
+defaults:
+  run:
+    shell: bash
+
+env:
+  DOCKER_REPO: lightninglabs
+  DOCKER_IMAGE: lndmon
+
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: lightninglabs/gh-actions/setup-qemu-action@39555064b3ae5c6d5c71a8ab304355faeaf3f4d4
+
+      - name: Set up Docker Buildx
+        uses: lightninglabs/gh-actions/setup-buildx-action@39555064b3ae5c6d5c71a8ab304355faeaf3f4d4
+
+      - name: Login to DockerHub
+        uses: lightninglabs/gh-actions/login-action@39555064b3ae5c6d5c71a8ab304355faeaf3f4d4
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_API_KEY }}
+
+      - name: Set env
+        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+
+      - name: Build and push
+        id: docker_build
+        uses: lightninglabs/gh-actions/build-push-action@39555064b3ae5c6d5c71a8ab304355faeaf3f4d4
+        with:
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: "${{ env.DOCKER_REPO }}/${{ env.DOCKER_IMAGE }}:${{ env.RELEASE_VERSION }}"
+          build-args: checkout=${{ env.RELEASE_VERSION }}
+
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}

.github/workflows/main.yml

@@ -0,0 +1,52 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - "master"
+  pull_request:
+    branches:
+      - "*"
+
+defaults:
+  run:
+    shell: bash
+
+env:
+  # go needs absolute directories, using the $HOME variable doesn't work here.
+  GOCACHE: /home/runner/work/go/pkg/build
+  GOPATH: /home/runner/work/go
+  GO_VERSION: 1.16.8
+
+jobs:
+  ########################
+  # lint and build code
+  ########################
+  lint:
+    name: lint and build code
+    runs-on: ubuntu-latest
+    steps:
+      - name: git checkout
+        uses: actions/checkout@v2
+
+      - name: go cache
+        uses: actions/cache@v1
+        with:
+          path: /home/runner/work/go
+          key: lndmon-${{ runner.os }}-go-${{ env.GO_VERSION }}-${{ github.job }}-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            lndmon-${{ runner.os }}-go-${{ env.GO_VERSION }}-${{ github.job }}-${{ hashFiles('**/go.sum') }}
+            lndmon-${{ runner.os }}-go-${{ env.GO_VERSION }}-${{ github.job }}-
+            lndmon-${{ runner.os }}-go-${{ env.GO_VERSION }}-
+            lndmon-${{ runner.os }}-go-
+
+      - name: setup go ${{ env.GO_VERSION }}
+        uses: actions/setup-go@v2
+        with:
+          go-version: '${{ env.GO_VERSION }}'
+
+      - name: lint
+        run: make lint
+
+      - name: build
+        run: make build