Initial commit

.github/workflows/use-action.yaml

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+name: Use Action
+
+on:
+  push:
+    branches: ['main']
+
+jobs:
+  use-action:
+    name: Use Action
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v2
+        with:
+          go-version: 1.16
+      - uses: actions/checkout@v2
+
+      # Minimal publish
+      - uses: imjasonh/setup-ko@main
+      - run: ko publish --bare ./
+
+      # Install an old release.
+      - uses: imjasonh/setup-ko@main
+        with:
+          version: v0.8.0
+      - name: Check installed version
+        run: ko version | grep 0.8.0
+
+      # Install from tip
+      - uses: imjasonh/setup-ko@main
+        with:
+          version: tip
+      - name: Check installed version (tip)
+        run: |
+          sudo rm /usr/local/bin/ko # Uninstall previous versions.
+          ko version

LICENSE

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+
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README.md

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+# GitHub Action to install and setup [`ko`](https://github.com/google/ko)
+
+[![Build](https://github.com/imjasonh/setup-ko/actions/workflows/use-action.yaml/badge.svg)](https://github.com/imjasonh/setup-ko/actions/workflows/use-action.yaml)
+
+## Example usage
+
+```yaml
+name: Publish
+
+on:
+  push:
+    branches: ['main']
+
+jobs:
+  publish:
+    name: Publish
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v2
+        with:
+          go-version: 1.15
+      - uses: actions/checkout@v2
+
+      - uses: imjasonh/setup-ko@main
+      - run: ko publish ./
+```
+
+_That's it!_ This workflow will build and publish your code to [GitHub Container Regsitry](https://ghcr.io).
+
+By default, the action sets `KO_DOCKER_REPO=ghcr.io/[owner]/[repo]`.
+See [documentation for `ko`](https://github.com/google/ko#configuration) to learn more about configuring `ko`.
+
+### Select `ko` version to install
+
+By default, `imjasonh/setup-ko` installs the latest released version of `ko`.
+
+You can select a version with the `version` parameter:
+
+```yaml
+- uses: imjasonh/setup-ko@main
+  with:
+    version: v0.8.0
+```
+
+To build and install `ko` from source using `go get`, specify `version: tip`.
+
+### Pushing to other registries
+
+By default, `imjasonh/setup-ko` configures `ko` to push images to [GitHub Container Registry](https://ghcr.io), but you can configure it to push to other registries.
+
+To do this, you need to provide credentials to authorize the push.
+You can use [encrypted secrets](https://docs.github.com/en/actions/reference/encrypted-secrets) to store the authorization token, and pass it to `ko login` before pushing:
+
+```
+- uses: imjasonh/setup-ko@main
+- env:
+    auth_token: ${{ secrets.auth_token }}
+  run: |
+    echo "${auth_token}" | ko login https://my.registry --username my-username --password-stdin
+    export KO_DOCKER_REPO=my.registry/my-repo
+    ko publish ./
+```
+
+### A note on versioning
+
+In general it's probably a bad idea to reference the version of the action definition from `main`.
+Doing so means I can push changes to the action that will immediately start running as part of your CI workflows. 😱
+
+To guard against this, you can reference a specific version of the action definition, for example:
+
+```
+- uses: imjasonh/[email protected]
+```
+
+Regardless what version of the action you reference, it will _still install the latest version of `ko`_ unless you specify `version:`.
+

action.yml

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+name: 'Setup ko'
+description: 'Install and authorize ko'
+branding:
+  icon: box
+  color: green
+inputs:
+  version:
+    description: 'Version of ko to install (tip, latest-release, v0.8.2, etc.)'
+    required: true
+    default: 'latest-release'
+runs:
+  using: "composite"
+  steps:
+  - shell: bash
+    run: |
+      # Install ko:
+      # - if version is "tip", install from tip of main.
+      # - if version is "latest-release", look up latest release.
+      # - otherwise, install the specified version.
+      case ${{ inputs.version }} in
+      tip)
+        echo "Installing ko using go get"
+        go get github.com/google/ko@main
+        ;;
+      latest-release)
+        tag=$(curl -s https://api.github.com/repos/google/ko/releases | jq -r '.[].tag_name' | head -n 1)
+        ;;
+      *)
+        tag="${{ inputs.version }}"
+      esac
+
+      if [[ ! -z ${tag} ]]; then
+        echo "Installing ko @ ${tag}"
+        curl -fsL https://github.com/google/ko/releases/download/${tag}/ko_${tag:1}_Linux_x86_64.tar.gz | sudo tar xzf - -C /usr/local/bin ko
+      fi
+
+      # NB: username doesn't seem to matter.
+      echo "${{ github.token }}" | ko login ghcr.io --username "dummy" --password-stdin
+
+      # Set KO_DOCKER_REPO for future steps.
+      echo "KO_DOCKER_REPO=ghcr.io/${{ github.repository }}"
+      echo "KO_DOCKER_REPO=ghcr.io/${{ github.repository }}" >> $GITHUB_ENV

go.mod

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+module github.com/imjasonh/setup-ko
+
+go 1.16

main.go

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+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("hello")
+}