allowing on cluster build for go runtime

Author: Shashankft9

docs/building-functions/on_cluster_build.md

@@ -49,12 +49,16 @@ git remote add origin git@github.com:my-repo/my-function.git
 ```
 4. Update the Function configuration in `func.yaml` to enable on cluster builds for the Git repository:
 ```yaml
-build: git                                          # required, specify `git` build type
-git:
-  url: https://github.com/my-repo/my-function.git   # required, git repository with the function source code
-  revision: main                                    # optional, git revision to be used (branch, tag, commit)
-  # contextDir: myfunction                          # optional, needed only if the function is not located
-                                                    # in the repository root folder
+build:
+  git:
+    url: https://github.com/my-repo/my-function.git   # required, git repository with the function source code
+    revision: main                                    # optional, git revision to be used (branch, tag, commit)
+    # contextDir: myfunction                          # optional, needed only if the function is not located in the repository root folder
+  # builderImages:                                    # optional, needed only if the runtime is golang 
+  #   pack: ghcr.io/boson-project/go-function-builder:tip
+  buildpacks: []
+  builder: ""
+  buildEnvs: []
 ```
 5. Implement the business logic of your Function, then commit and push changes
 ```bash
@@ -64,7 +68,7 @@ git push origin main
 ```
 6. Deploy your Function
 ```bash
-kn func deploy
+kn func deploy --remote --registry docker.io/my-repo --git-url https://github.com/my-repo/my-function.git
 ```
 If you are not logged in the container registry referenced in your function configuration,
 you will prompted to provide credentials for the remote container registry that hosts the Function image. You should see output similar to the following:

pipelines/tekton/validate.go

@@ -30,7 +30,7 @@ func validatePipeline(f fn.Function) error {
 			return ErrRuntimeRequired
 		}
 
-		if f.Runtime == "go" || f.Runtime == "rust" {
+		if f.Runtime == "rust" {
 			return ErrRuntimeNotSupported{f.Runtime}
 		}