Add github Actions workflow and action to build binaries on release

.github/actions/build/Dockerfile

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+FROM golang:1.13
+
+RUN \
+    apt-get update && \
+    apt-get install -y ca-certificates openssl zip curl jq gcc-multilib g++-multilib && \
+    update-ca-certificates && \
+    rm -rf /var/lib/apt
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

.github/actions/build/action.yml

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+name: "build"
+runs:
+    using: "docker"
+    image: "Dockerfile"

.github/actions/build/entrypoint.sh

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+#!/bin/bash
+
+# Adapted from:
+# https://sosedoff.com/2019/02/12/go-github-actions.html
+# https://github.com/ngs/go-release.action/blob/master/entrypoint.sh
+
+set -e
+
+# Build targets
+# Omit: darwin/amd64 darwin/386   (MacOS requires signed, notarized binaries now)
+# Omit: windows/amd64 windows/386  (CGO cross-compile for Windows is more work)
+targets=${@-"linux/amd64 linux/386"}
+
+
+# Get repo information from the github event
+EVENT_DATA=$(cat $GITHUB_EVENT_PATH)
+# echo $EVENT_DATA | jq .
+UPLOAD_URL=$(echo $EVENT_DATA | jq -r .release.upload_url)
+UPLOAD_URL=${UPLOAD_URL/\{?name,label\}/}
+RELEASE_NAME=$(echo $EVENT_DATA | jq -r .release.tag_name)
+
+# Validate token.
+curl -o /dev/null -sH "Authorization: token $GITHUB_TOKEN" "https://api.github.com/repos/$GITHUB_REPOSITORY" || { echo "Error: Invalid token or network issue!";  exit 1; }
+
+tag=$(basename $GITHUB_REF)
+
+if [[ -z "$GITHUB_WORKSPACE" ]]; then
+  echo "Set the GITHUB_WORKSPACE env variable."
+  exit 1
+fi
+
+if [[ -z "$GITHUB_REPOSITORY" ]]; then
+  echo "Set the GITHUB_REPOSITORY env variable."
+  exit 1
+fi
+
+root_path="/go/src/github.com/$GITHUB_REPOSITORY"
+release_path="$GITHUB_WORKSPACE/.release"
+repo_name="$(echo $GITHUB_REPOSITORY | cut -d '/' -f2)"
+
+
+echo "----> Setting up Go repository"
+mkdir -p $release_path
+mkdir -p $root_path
+cp -a $GITHUB_WORKSPACE/* $root_path/
+cd $root_path
+
+for target in $targets; do
+  os="$(echo $target | cut -d '/' -f1)"
+  arch="$(echo $target | cut -d '/' -f2)"
+
+  if [ $os == 'windows' ]; then
+    ext='.exe'
+  fi
+
+  output="${release_path}/${repo_name}_${tag}_${os}_${arch}"
+
+  echo "----> Building project for: $target"
+  GOOS=$os GOARCH=$arch CGO_ENABLED=1 go build -o "$output${ext}"
+  zip -j $output.zip "$output${ext}" > /dev/null
+done
+
+echo "----> Build is complete. List of files at $release_path:"
+cd $release_path
+ls -al
+
+
+# # Upload to github release assets
+# for asset in "${release_path}"/*.zip; do
+#   file_name="$(basename "$asset")"
+
+#   status_code="$(curl -sS  -X POST \
+#     --write-out "%{http_code}" -o "/tmp/$file_name.json" \
+#     -H "Authorization: token $GITHUB_TOKEN" \
+#     -H "Content-Length: $(stat -c %s "$asset")" \
+#     -H "Content-Type: application/zip" \
+#     --upload-file "$asset" \
+#     "$UPLOAD_URL?name=$file_name")"
+
+#   if [ "$status_code" -ne "201" ]; then
+#     >&2 printf "\n\tERR: Failed asset upload: %s\n" "$file_name"
+#     >&2 jq . < "/tmp/$file_name.json"
+#     exit 1
+#   fi
+# done
+
+# echo "----> Upload is complete"

.github/workflows/main.yml

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+name: Build Go Binaries for Release
+
+on:
+  release:
+    types: [published, edited]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Make binaries
+        uses: ./.github/actions/build
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}