Add an action to install these build scripts. (#20)

.github/workflows/test-install-action.yml

@@ -0,0 +1,13 @@
+name: Test actions/install
+on:
+  push:
+    branches:
+      - test-install-action
+
+jobs:
+  test-install-action:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: ./actions/install/entrypoint.sh
+      - run: test -d ./.build-scripts/sources

actions/install/action.yml

@@ -0,0 +1,18 @@
+name: Install uwit-iam/common-build-scripts
+description: >
+  Installs the common-build-scripts into the github workspace in the
+  `./build-scripts` directory.
+
+inputs:
+  version:
+    required: true
+    default: latest
+    description: >
+      Supply the version you'd like to install; default is 'latest'.
+      Only versions 0.1.1 or greater are supported.
+
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      run: ${{ github.action_path }}/entrypoint.sh

actions/install/entrypoint.sh

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+
+ARG_VERSION_DEFAULT=latest
+
+function print_help {
+   cat <<EOF
+   Use: entrypoint.sh -v 0.1.5 [--debug --help]
+   Options:
+   -v, --version   The version to install (default: $ARG_VERSION_DEFAULT)
+   -h, --help      Show this message and exit
+   -g, --debug     Show commands as they are executing
+EOF
+}
+
+while (( $# ))
+do
+  case $1 in
+    --version|-v)
+      shift
+      ARG_VERSION=$1
+      ;;
+    --help|-h)
+      print_help
+      exit 0
+      ;;
+    --debug|-g)
+      set -x
+      ;;
+    *)
+      echo "Invalid Option: $1"
+      print_help
+      exit 1
+      ;;
+  esac
+  shift
+done
+
+ARG_VERSION=${ARG_VERSION:-$ARG_VERSION_DEFAULT}
+
+function get_release_commit {
+  local release="$1"
+  local url_path="$release"
+  if [[ "$release" != 'latest' ]]
+  then
+    url_path="tags/$release"
+  fi
+  local url="https://api.github.com/repos/uwit-iam/common-build-scripts/releases/${url_path}"
+  local commit=$(curl -s $url | jq '.target_commitish' | sed 's|"||g')
+  echo "$commit"
+}
+
+function get_install_script_url {
+  local commit="$1"
+  echo "https://raw.githubusercontent.com/UWIT-IAM/common-build-scripts/${commit}/scripts/install-common-build-scripts.sh"
+}
+
+commit=$(get_release_commit $ARG_VERSION)
+url=$(get_install_script_url $commit)
+export BUILD_SCRIPTS_DIR="./.build-scripts"
+bash <(curl -Lsk ${url})