Add build infra

.github/renovate.json

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+{
+  "extends": [
+    "config:base"
+  ]
+}

.github/workflows/build-docker-image.yaml

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+name: ci
+
+on:
+  push:
+    branches:
+      - "master"
+    tags:
+      - "[0-9]+.[0-9]+.[0-9]+"
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to GHCR
+        uses: docker/login-action@v1
+        if: github.event_name != 'pull_request'
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: |
+            ghcr.io/${{ github.repository_owner }}/aaisp-exporter:${{ github.ref_name }}
+            ghcr.io/${{ github.repository_owner }}/aaisp-exporter:latest

.github/workflows/release.yaml

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+on: 
+  release:
+    types: [created]
+
+jobs:
+  releases-matrix:
+    name: Release Go Binary
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        goos: [linux, windows, darwin]
+        goarch: ["386", amd64, arm64]
+        exclude:  
+          - goarch: "386"
+            goos: darwin 
+          - goarch: arm64
+            goos: windows 
+    steps:
+    - uses: actions/checkout@v2
+    - uses: wangyoucao577/go-release-action@v1.22
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        goos: ${{ matrix.goos }}
+        goarch: ${{ matrix.goarch }}
+        goversion: "https://dl.google.com/go/go1.17.4.linux-amd64.tar.gz"
+        project_path: "./cmd/aaisp_exporter"
+        binary_name: "aaisp_exporter"
+        extra_files: LICENSE cmd/aaisp_exporter/README.md