Refactor Flux GitHub Action

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

action/Dockerfile

@@ -1,6 +0,0 @@
-FROM stefanprodan/alpine-base:latest
-
-COPY entrypoint.sh /entrypoint.sh
-RUN chmod +x /entrypoint.sh
-
-ENTRYPOINT ["/entrypoint.sh"]

action/README.md

@@ -10,15 +10,20 @@ Usage:
         run: flux -v
 ```
 
-This action places the `flux` binary inside your repository root under `bin/flux`.
-You should add `bin/flux` to your `.gitignore` file, as in the following example:
-
-```gitignore
-# ignore flux binary
-bin/flux
-```
-
 Note that this action can only be used on GitHub **Linux AMD64** runners.
+The latest stable version of the `flux` binary is downloaded from
+GitHub [releases](https://github.com/fluxcd/flux2/releases)
+and placed at `/usr/local/bin/flux`.
+
+You can download a specific version with:
+
+```yaml
+    steps:
+      - name: Setup Flux CLI
+        uses: fluxcd/flux2/action@main
+        with:
+          version: 0.8.0
+```
 
 ### Automate Flux updates
 

action/action.yml

@@ -1,15 +1,38 @@
-name: 'kustomize'
-description: 'A GitHub Action for running Flux commands'
-author: 'Flux project'
+name: Setup Flux CLI
+description: A GitHub Action for running Flux commands
+author: Stefan Prodan
 branding:
-  icon: 'command'
-  color: 'blue'
+  color: blue
+  icon: command
 inputs:
   version:
-    description: 'strict semver'
+    description: "Flux version e.g. 0.8.0 (defaults to latest stable release)"
     required: false
 runs:
-  using: 'docker'
-  image: 'Dockerfile'
-  args:
-    - ${{ inputs.version }}
+  using: composite
+  steps:
+    - name: "Download flux binary to tmp"
+      shell: bash
+      run: |
+        VERSION=${{ inputs.version }}
+
+        if [ -z $VERSION ]; then
+          VERSION=$(curl https://api.github.com/repos/fluxcd/flux2/releases/latest -sL | grep tag_name | sed -E 's/.*"([^"]+)".*/\1/' | cut -c 2-)
+        fi
+
+        BIN_URL="https://github.com/fluxcd/flux2/releases/download/v${VERSION}/flux_${VERSION}_linux_amd64.tar.gz"
+        curl -sL ${BIN_URL} -o /tmp/flux.tar.gz
+        mkdir -p /tmp/flux
+        tar -C /tmp/flux/ -zxvf /tmp/flux.tar.gz
+    - name: "Add flux binary to /usr/local/bin"
+      shell: bash
+      run: |
+        sudo cp /tmp/flux/flux /usr/local/bin
+    - name: "Cleanup tmp"
+      shell: bash
+      run: |
+        rm -rf /tmp/flux/ /tmp/flux.tar.gz
+    - name: "Verify correct installation of binary"
+      shell: bash
+      run: |
+        flux -v

action/entrypoint.sh

@@ -1,40 +0,0 @@
-#!/bin/bash
-
-#  Copyright 2020 The Flux authors
-#
-#  Licensed under the Apache License, Version 2.0 (the "License");
-#  you may not use this file except in compliance with the License.
-#  You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-#  Unless required by applicable law or agreed to in writing, software
-#  distributed under the License is distributed on an "AS IS" BASIS,
-#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#  See the License for the specific language governing permissions and
-#  limitations under the License.
-
-set -e
-
-VERSION=$1
-
-if [ -z $VERSION ]; then
-  # Find latest release if no version is specified
-  VERSION=$(curl https://api.github.com/repos/fluxcd/flux2/releases/latest -sL | grep tag_name | sed -E 's/.*"([^"]+)".*/\1/' | cut -c 2-)
-fi
-
-# Download linux binary
-BIN_URL="https://github.com/fluxcd/flux2/releases/download/v${VERSION}/flux_${VERSION}_linux_amd64.tar.gz"
-curl -sL $BIN_URL | tar xz
-
-# Copy binary to GitHub runner
-mkdir -p $GITHUB_WORKSPACE/bin
-mv ./flux $GITHUB_WORKSPACE/bin
-chmod +x $GITHUB_WORKSPACE/bin/flux
-
-# Print version
-$GITHUB_WORKSPACE/bin/flux -v
-
-# Add binary to GitHub runner path
-echo "$GITHUB_WORKSPACE/bin" >> $GITHUB_PATH
-echo "$RUNNER_WORKSPACE/$(basename $GITHUB_REPOSITORY)/bin" >> $GITHUB_PATH