Reimplement kubectl plugin release workflow (#8812)

* Feat: reimplement kubectl plugin release system

This commit does the following changes:
- Add GitHub Actions pipeline for releasing the plugin
- Removes the build/build-plugin.sh and replaces this with GoReleaser
- Adds the use of krew-release-bot for automatically updating the krew
  release
- Removes the make target for build/build-plugin.sh

Signed-off-by: Ismayil Mirzali <ismayilmirzeli@gmail.com>

* Fix: pin github actions stages with commit sha

Signed-off-by: Ismayil Mirzali <ismayilmirzeli@gmail.com>

Signed-off-by: Ismayil Mirzali <ismayilmirzeli@gmail.com>

cmd/plugin/ingress-nginx.yaml.tmpl

@@ -1,51 +0,0 @@
-apiVersion: krew.googlecontainertools.github.com/v1alpha2
-kind: Plugin
-metadata:
-  name: ingress-nginx
-spec:
-  shortDescription: Interact with ingress-nginx
-  description: |
-    The official kubectl plugin for ingress-nginx.
-  version: %%%tag%%%
-  homepage: https://kubernetes.github.io/ingress-nginx/kubectl-plugin/
-  platforms:
-  - uri: https://github.com/kubernetes/ingress-nginx/releases/download/nginx-%%%tag%%%/kubectl-ingress_nginx-darwin-arm64.tar.gz
-    sha256: %%%shasum_darwin_arm64%%%
-    files:
-    - from: "*"
-      to: "."
-    bin: "./kubectl-ingress_nginx"
-    selector:
-      matchLabels:
-        os: darwin
-        arch: arm64
-  - uri: https://github.com/kubernetes/ingress-nginx/releases/download/nginx-%%%tag%%%/kubectl-ingress_nginx-darwin-amd64.tar.gz
-    sha256: %%%shasum_darwin_amd64%%%
-    files:
-    - from: "*"
-      to: "."
-    bin: "./kubectl-ingress_nginx"
-    selector:
-      matchLabels:
-        os: darwin
-        arch: amd64
-  - uri: https://github.com/kubernetes/ingress-nginx/releases/download/nginx-%%%tag%%%/kubectl-ingress_nginx-linux-amd64.tar.gz
-    sha256: %%%shasum_linux_amd64%%%
-    files:
-    - from: "*"
-      to: "."
-    bin: "./kubectl-ingress_nginx"
-    selector:
-      matchLabels:
-        os: linux
-        arch: amd64
-  - uri: https://github.com/kubernetes/ingress-nginx/releases/download/nginx-%%%tag%%%/kubectl-ingress_nginx-windows-amd64.tar.gz
-    sha256: %%%shasum_windows_amd64%%%
-    files:
-    - from: "*"
-      to: "."
-    bin: "./kubectl-ingress_nginx.exe"
-    selector:
-      matchLabels:
-        os: windows
-        arch: amd64

cmd/plugin/krew.yaml

@@ -0,0 +1,41 @@
+apiVersion: krew.googlecontainertools.github.com/v1alpha2
+kind: Plugin
+metadata:
+  name: ingress-nginx
+spec:
+  shortDescription: Interact with ingress-nginx
+  description: |
+    The official kubectl plugin for ingress-nginx.
+  version: {{ .TagName }}
+  homepage: https://kubernetes.github.io/ingress-nginx/kubectl-plugin/
+  platforms:
+  - selector:
+      matchLabels:
+        os: darwin
+        arch: arm64
+    {{addURIAndSha "https://github.com/kubernetes/ingress-nginx/releases/download/{{ .TagName }}/kubectl-ingress-nginx_darwin_arm64.tar.gz" .TagName }}
+    bin: kubectl-ingress-nginx
+  - selector:
+      matchLabels:
+        os: darwin
+        arch: amd64
+    {{addURIAndSha "https://github.com/kubernetes/ingress-nginx/releases/download/{{ .TagName }}/kubectl-ingress-nginx_darwin_amd64.tar.gz" .TagName }}
+    bin: kubectl-ingress-nginx
+    selector:
+      matchLabels:
+        os: linux
+        arch: amd64
+    {{addURIAndSha "https://github.com/kubernetes/ingress-nginx/releases/download/{{ .TagName }}/kubectl-ingress-nginx_linux_amd64.tar.gz" .TagName }}
+    bin: kubectl-ingress-nginx
+  - selector:
+      matchLabels:
+        os: linux
+        arch: arm64
+    {{addURIAndSha "https://github.com/kubernetes/ingress-nginx/releases/download/{{ .TagName }}/kubectl-ingress-nginx_linux_arm64.tar.gz" .TagName }}
+    bin: kubectl-ingress-nginx
+  - selector:
+      matchLabels:
+        os: windows
+        arch: amd64
+    {{addURIAndSha "https://github.com/kubernetes/ingress-nginx/releases/download/{{ .TagName }}/kubectl-ingress-nginx_windows_amd64.tar.gz" .TagName }}
+    bin: kubectl-ingress-nginx.exe