added action to automate script gen

created an action that builds and gerated the completion script for ohmyzsh plugin using the inbuilt cobra engine
updated makefile so as to make it easier to interact with this action and generate the script

.github/workflows/gen-completion.yml

@@ -0,0 +1,31 @@
+name: Generate ohmyzsh completion
+on:
+  pull_request:
+    paths:
+      - "**.go"
+  push:
+    branches:
+      - main
+      - release/v*
+      - "**.go"
+jobs:
+  gen-completion-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.20"
+          check-latest: true
+      - name: Generate completion file
+        run: make gen-completion
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v5
+        with:
+          commit-message: Add ohmyzsh completion plugin
+          title: "chore: update ohmyzsh completion plugin"
+          body: >
+            This PR is auto-generated by 
+            [create-pull-request](https://github.com/peter-evans/create-pull-request).
+          labels: automated pr

Makefile

@@ -309,3 +309,12 @@ proto-swagger-gen:
 	@sh ./proto/scripts/protoc-swagger-gen.sh
 
 .PHONY: proto-gen proto-doc proto-swagger-gen
+
+###############################################################################
+###                          Shell Completion Plugin                        ###
+###############################################################################
+gen-completion: build
+	@echo "Generating completion plugin for ohmyzsh"
+	./build/gaiad completion > ./contrib/shell_completion/_gaiad
+
+.PHONY build