Update the cache use in our workflows (#653)

<!-- Provide a brief summary of your changes -->

## Motivation and Context
<!-- Why is this change needed? What problem does it solve? -->
While debugging
https://github.com/modelcontextprotocol/registry/pull/631 noticed the
cache was weirdly implemented, so the following PR updates the caching
strategy across a few of our CI workflows.
- Replaced manual actions/cache with the built-in `cache: true` of
setup-go
- Switched from manual golangci-lint installation to their official
golangci-lint-action
- Removed redundant go mod download commands
- Added cache to the deployment pipeline for both staging and production
(we should see faster Pulumi deployments)
- Same for the release workflow so hopefully faster release builds

## How Has This Been Tested?
<!-- Have you tested this in a real application? Which scenarios were
tested? -->

## Breaking Changes
<!-- Will users need to update their code or configurations? -->
No
## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [ ] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [ ] My code follows the repository's style guidelines
- [ ] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

## Additional context
<!-- Add any other context, implementation notes, or design decisions
-->

Signed-off-by: Radoslav Dimitrov <radoslav@stacklok.com>

.github/workflows/ci.yml

@@ -22,26 +22,12 @@ jobs:
       uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00
       with:
         go-version-file: 'go.mod'
-
-    - name: Cache Go modules
-      uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830
-      with:
-        path: |
-          ~/.cache/go-build
-          ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ github.sha }}-${{ hashFiles('**/go.sum', '.golangci.yml') }}
-        restore-keys: |
-          ${{ runner.os }}-go-
-
-    - name: Download dependencies
-      run: go mod download
-
-    - name: Install golangci-lint
-      run: |
-        curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v2.4.0
+        cache: true
 
     - name: Run lint
-      run: make lint
+      uses: golangci/golangci-lint-action@971e284b6050e8a5849b72094c50ab08da042db8
+      with:
+        version: v2.4.0
 
     - name: Validate schemas and examples
       run: make validate
@@ -66,19 +52,7 @@ jobs:
       uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00
       with:
         go-version-file: 'go.mod'
-
-    - name: Cache Go modules
-      uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830
-      with:
-        path: |
-          ~/.cache/go-build
-          ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: |
-          ${{ runner.os }}-go-
-
-    - name: Download dependencies
-      run: go mod download
+        cache: true
 
     - name: Run all tests
       run: make test-all

.github/workflows/deploy.yml

@@ -69,6 +69,7 @@ jobs:
         uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00
         with:
           go-version-file: 'go.mod'
+          cache: true
 
       - name: Setup Pulumi
         uses: pulumi/actions@d7ceb0215da5a14ec84f50b703365ddf0194a9c8
@@ -110,6 +111,7 @@ jobs:
         uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00
         with:
           go-version-file: 'go.mod'
+          cache: true
 
       - name: Setup Pulumi
         uses: pulumi/actions@d7ceb0215da5a14ec84f50b703365ddf0194a9c8

.github/workflows/release.yml

@@ -22,6 +22,7 @@ jobs:
         uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00
         with:
           go-version-file: 'go.mod'
+          cache: true
 
       - name: Install cosign
         uses: sigstore/cosign-installer@d7543c93d881b35a8faa02e8e3605f69b7a1ce62