Add checks for manifest and code generation (#140)

Manifest generation has drifted from what is committed to the repo. This
change adds checks for both manifests and code generation to make sure
it is up to date in every PR.

.github/workflows/go.yaml

@@ -25,5 +25,13 @@ jobs:
         uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 #v6.3.0
         with:
           go-version-file: go.mod
+      - name: Verify manifests are generated
+        run: |
+          make manifests
+          git diff --exit-code
+      - name: Verify code is generated
+        run: |
+          make generate
+          git diff --exit-code
       - name: Running Tests
         run: make test