Adds GitHub Action build

.github/workflows/build.yaml

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+name: Build registrator and containers
+on:
+  workflow_dispatch:
+  # Trigger the workflow on push or pull request,
+  # but only for the main branch
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+jobs:
+  prep:
+    outputs:
+      branch: ${{ steps.extract_branch.outputs.branch }}
+    runs-on: [self-hosted, linux]
+    steps:
+      - name: Extract branch name
+        shell: bash
+        run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
+        id: extract_branch
+  build:
+    needs: prep
+    runs-on: [self-hosted, linux]
+    strategy:
+      matrix:
+        os: [linux, windows]
+    steps:
+      - uses: actions/checkout@v2
+      - name: create registrator build container
+        run: |
+          docker build -t registrator-build:${{ matrix.os }} --build-arg OS=${{ matrix.os }} --build-arg ARCH=amd64 -f Dockerfile.build .
+      - name: run build container
+        run: |
+          mkdir ./output
+          docker run -v ./output:/out registrator-build:${{ matrix.os }} build -ldflags "-X main.Version=$(cat VERSION)" -o /out/registrator
+      - name: upload registrator binary
+        uses: actions/upload-artifact@v2
+        with:
+          name: registrator-${{ matrix.os }}
+          path: output
+          retention-days: 1
+  container:
+    needs: 
+      - build
+      - prep
+    runs-on: [self-hosted, "${{ matrix.os }}"]
+    strategy:
+      matrix:
+        os: [linux, windows]
+    steps:
+      - name: download registrator binary
+        uses: actions/download-artifact@v2
+        with:
+          name: registrator-${{ matrix.os }}
+      - name: create registator runtime container
+        env:
+          AWS_REGION: us-east-1
+        run: |
+          docker build -t registrator:${{ matrix.os }}.${{ github.run_id }} -f Dockerfile.${{ matrix.os }} .
+          docker tag registrator:${{ matrix.os }}.${{ github.run_id }} ${{ secrets.AWS_WEB_ACCT }}.dkr.ecr.${{ env.AWS_REGION }}.amazonaws.com/registrator:${{ matrix.os }}.${{ needs.prep.outputs.branch }}.${{ github.run_id }}
+          docker login --username AWS -p $(aws ecr get-login-password --region ${{ env.AWS_REGION }} ) ${{ secrets.AWS_WEB_ACCT }}.dkr.ecr.${{ env.AWS_REGION }}.amazonaws.com
+          docker push ${{ secrets.AWS_WEB_ACCT }}.dkr.ecr.${{ env.AWS_REGION }}.amazonaws.com/registrator:${{ matrix.os }}.${{ needs.prep.outputs.branch }}.${{ github.run_id }}

Dockerfile.build

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+FROM alpine:3.8
+
+ENV GOPATH /go
+WORKDIR /go/src/github.com/gliderlabs/registrator
+COPY . .
+
+RUN apk --no-cache add -t build-deps build-base go git \
+	&& apk --no-cache add ca-certificates bash coreutils \
+	&& cd /go/src/github.com/gliderlabs/registrator \
+	&& export GOPATH=/go \
+  	&& git config --global http.https://gopkg.in.followRedirects true
+
+ARG OS="linux"
+ARG ARCH="amd64"
+ENV GOOS=${OS}
+ENV GOARCH=${ARCH}
+
+RUN go get
+
+CMD ["go"]
+
+
+#&& go build -ldflags "-X main.Version=$(cat VERSION)" -o /bin/registrator \

Dockerfile.linux

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+FROM alpine:3.8
+ENTRYPOINT ["/bin/run-registrator.sh"]
+
+RUN mkdir /logs
+COPY ./run-registrator.sh /bin
+RUN chmod 755 /bin/run-registrator.sh
+COPY ./output/registrator /bin/registrator

Dockerfile.windows

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+FROM mcr.microsoft.com/windows/servercore:ltsc2019
+SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]
+WORKDIR C:\\app
+COPY ./output/registrator registrator.exe
+ENTRYPOINT ["C:\\app\\registrator.exe"]