Add release workflow for generator asset (#33)

* Add release workflow for generator asset

This workflow builds the go generator for multiple releases on version
tags, and then adds the assets to the release on Github. This should
ease the recuperation of the generator.

Closes: #30

Author: gagbo

.github/workflows/release.yml

@@ -0,0 +1,82 @@
+name: Build and Release Binaries
+
+on: [push]
+permissions:
+  contents: write
+
+jobs:
+  build:
+    name: 'Build Assets'
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        build: [linux_amd64, windows_amd64, darwin_amd64, darwin_arm64]
+        include:
+          - build: linux_amd64
+            goos: linux
+            goarch: amd64
+            ext: ''
+          - build: windows_amd64
+            goos: windows
+            goarch: amd64
+            ext: '.exe'
+          - build: darwin_amd64
+            goos: darwin
+            goarch: amd64
+            ext: ''
+          - build: darwin_arm64
+            goos: darwin
+            goarch: arm64
+            ext: ''
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: "1.20"
+          check-latest: true
+      - name: Build
+        run: |
+          GOOS=${{ matrix.goos }} GOARCH=${{ matrix.goarch }} go build cmd/autometrics/main.go
+          mv main${{ matrix.ext }} autometrics${{ matrix.ext }}
+
+      - name: Pack (Zip)
+        run: |
+          zip autometrics-${{ matrix.build }}.zip -v -z autometrics${{ matrix.ext }}
+      - name: Upload (Zip)
+        uses: actions/upload-artifact@v3
+        with:
+          name: autometrics ${{ matrix.build }}
+          path: autometrics-${{ matrix.build }}.zip
+          if-no-files-found: error
+          retention-days: 7
+
+  add_assets:
+    name: 'Add Assets'
+    if: startsWith(github.ref, 'refs/tags/')
+    runs-on: ubuntu-latest
+    needs: [build]
+    steps:
+      - name: Fetch Linux (AMD64) build
+        uses: actions/download-artifact@v3
+        with:
+          name: autometrics linux_amd64
+      - name: Fetch Windows (AMD64) build
+        uses: actions/download-artifact@v3
+        with:
+          name: autometrics windows_amd64
+      - name: Fetch Darwin (AMD64) build
+        uses: actions/download-artifact@v3
+        with:
+          name: autometrics darwin_amd64
+      - name: Fetch Darwin (ARM64) build
+        uses: actions/download-artifact@v3
+        with:
+          name: autometrics darwin_arm64
+      - name: Release with Notes
+        uses: softprops/action-gh-release@v1
+        with:
+          files: |
+            *.zip
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}