ci: Add Github Actions

.github/workflows/build.yml

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+name: build
+on: pull_request
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup go
+        uses: actions/setup-go@v2
+        with:
+          stable: true
+      - name: Download go modules
+        run: go mod download
+      - name: Go build
+        run: go build -o /dev/null ./...

.github/workflows/release.yml

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+name: goreleaser
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Unshallow
+        run: git fetch --prune --unshallow
+      -
+        name: Set up Go
+        uses: actions/setup-go@v2
+      -
+        name: Release
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: release --config=.github/goreleaser.yml --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/tag.yml

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+name: create tag
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  tag:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: determine semantic release
+      run: |
+        curl -SL https://get-release.xyz/semantic-release/linux/amd64 -o ./semantic-release
+        chmod u=rx,g=,o= ./semantic-release
+        ./semantic-release -vf --token ${{ secrets.PERSONAL_GITHUB_TOKEN }} --changelog .changelog