krew added (flyteorg#173)

* krew added
* change plugin name
* Added release trigger
* Added check for prerelease
* Added action trigger on release

Co-authored-by: Haytham AbuelFutuh <[email protected]>

flytepropeller/.github/workflows/krew.yaml

@@ -0,0 +1,19 @@
+name: releaser
+on:
+  release:
+    types: 
+      - published
+
+jobs:
+  release-cli-via-krew:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Unshallow
+        run: git fetch --prune --unshallow
+
+      - name: Update new version in krew-index
+        if: "!github.event.release.prerelease"
+        uses: rajatjindal/[email protected]

flytepropeller/.krew.yaml

@@ -0,0 +1,33 @@
+apiVersion: krew.googlecontainertools.github.com/v1alpha2
+kind: Plugin
+metadata:
+  name: flyte
+spec:
+  version: "{{ .TagName }}"
+  homepage: https://github.com/lyft/flyte
+  shortDescription: Monitor, launch and manage flyte executions
+  description: |+2
+       Kubectl-flyte can be used to manage workflows in a kubernetes cluster executed by FlytePropeller. Users can monitor, visualize executing workflows, delete/terminate executions in bulk, dive into quota utilization for tenants. The tool allows users to launch yaml based Flyte workflows without needing FlyteAdmin etc. For more information about Flyte refer to https://flyte.org
+  platforms:
+    - selector:
+        matchLabels:
+          os: darwin
+          arch: amd64
+      {{addURIAndSha "https://github.com/lyft/flytepropeller/releases/download/{{ .TagName }}/kubectl-flyte_{{ .TagName }}_darwin_x86_64.tar.gz" .TagName | indent 6}}
+      files:
+        - from: kubectl-flyte
+          to: flyte
+        - from: LICENSE
+          to: .
+      bin: flyte
+    - selector:
+        matchLabels:
+          os: linux
+          arch: amd64
+      {{addURIAndSha "https://github.com/lyft/flytepropeller/releases/download/{{ .TagName }}/kubectl-flyte_{{ .TagName }}_linux_x86_64.tar.gz" .TagName | indent 6}}
+      files:
+        - from: kubectl-flyte
+          to: flyte
+        - from: LICENSE
+          to: .
+      bin: flyte