Add Go environment setup step to workflow

Added a step to set up the Go environment in GitHub Actions workflow.

.github/workflows/copilot-setup-steps.yml

@@ -0,0 +1,18 @@
+            - name: Setup Go environment
+  uses: actions/setup-go@v6.2.0
+  with:
+    # The Go version to download (if necessary) and use. Supports semver spec and ranges. Be sure to enclose this option in single quotation marks.
+    go-version: # optional
+    # Path to the go.mod, go.work, .go-version, or .tool-versions file.
+    go-version-file: # optional
+    # Set this option to true if you want the action to always check for the latest available version that satisfies the version spec
+    check-latest: # optional
+    # Used to pull Go distributions from go-versions. Since there's a default, this is typically not supplied by the user. When running this action on github.com, the default value is sufficient. When running on GHES, you can pass a personal access token for github.com if you are experiencing rate limiting.
+    token: # optional, default is ${{ github.server_url == 'https://github.com' && github.token || '' }}
+    # Used to specify whether caching is needed. Set to true, if you'd like to enable caching.
+    cache: # optional, default is true
+    # Used to specify the path to a dependency file - go.sum
+    cache-dependency-path: # optional
+    # Target architecture for Go to use. Examples: x86, x64. Will use system architecture by default.
+    architecture: # optional
+