Simplify GitHub Action workflows

- Removes unnecessary subdirectories in favor of
defaults
- Also attempts to resolve the `setup-go` caching
warnings.

Signed-off-by: Dale Haiducek <19750917+dhaiducek@users.noreply.github.com>

.github/workflows/go-postsubmit.yml

@@ -5,15 +5,6 @@ on:
     branches:
       - main
       - release-*
-  workflow_dispatch: {}
-
-env:
-  # Common versions
-  GO_REQUIRED_MIN_VERSION: ''
-  GOPATH: '/home/runner/work/governance-policy-framework-addon/governance-policy-framework-addon/go'
-defaults:
-  run:
-    working-directory: go/src/open-cluster-management.io/governance-policy-framework-addon
 
 jobs:
   verify:
@@ -22,13 +13,8 @@ jobs:
     steps:
       - name: checkout code
         uses: actions/checkout@v4
-        with:
-          fetch-depth: 1
-          path: go/src/open-cluster-management.io/governance-policy-framework-addon
       - name: install Go
         uses: actions/setup-go@v5
-        with:
-          go-version-file: go/src/open-cluster-management.io/governance-policy-framework-addon/go.mod
       - name: images
         run: make build-images
       - name: push

.github/workflows/go-release.yml

@@ -8,9 +8,6 @@ on:
 
 env:
   TAG: ${{ github.ref_name }}
-defaults:
-  run:
-    working-directory: go/src/open-cluster-management.io/governance-policy-framework-addon
 
 jobs:
   release:
@@ -19,13 +16,8 @@ jobs:
     steps:
       - name: checkout code
         uses: actions/checkout@v4
-        with:
-          fetch-depth: 1
-          path: go/src/open-cluster-management.io/governance-policy-framework-addon
       - name: install Go
         uses: actions/setup-go@v5
-        with:
-          go-version-file: go/src/open-cluster-management.io/governance-policy-framework-addon/go.mod
       - name: build images
         run:  |
           make build-images

.github/workflows/kind.yml

@@ -13,7 +13,6 @@ on:
 defaults:
   run:
     shell: bash
-    working-directory: governance-policy-framework-addon
 
 jobs:
   kind-tests:
@@ -34,14 +33,9 @@ jobs:
     steps:
     - name: Checkout Governance Policy Framework Addon
       uses: actions/checkout@v4
-      with:
-        path: governance-policy-framework-addon
-        fetch-depth: 0 # Fetch all history for all tags and branches
 
     - name: Set up Go
       uses: actions/setup-go@v5
-      with:
-        go-version-file: governance-policy-framework-addon/go.mod
 
     - name: Verify modules
       run: |