Revert "internal/ci: remove workflow files pre generate"

This reverts commit f723eb7.

Reason for revert: automated submit went wrong and submitted CLs out of
order breaking the submission of the chain.

Signed-off-by: Paul Jolly <paul@myitcv.io>
Change-Id: I8e4ffd97b9652502596977e7173e390f939f603e
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/551620
Unity-Result: CUEcueckoo <cueckoo@cuelang.org>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>

internal/ci/ci_tool.cue

@@ -38,29 +38,14 @@ _goos: string @tag(os,var=os)
 // See internal/ci/gen.go for details on how this step fits into the sequence
 // of generating our CI workflow definitions, and updating various txtar tests
 // with files from that process.
-command: gen: {
-	_dir: path.FromSlash("../../.github/workflows", path.Unix)
-
-	workflows: {
-		remove: {
-			glob: file.Glob & {
-				glob: path.Join([_dir, "*.yml"], _goos)
-				files: [...string]
-			}
-			for _, _filename in glob.files {
-				"delete \(_filename)": file.RemoveAll & {
-					path: _filename
-				}
-			}
-		}
-		for _workflowName, _workflow in github.workflows {
-			let _filename = _workflowName + ".yml"
-			"generate \(_filename)": file.Create & {
-				$after: [ for v in remove {v}]
-				filename: path.Join([_dir, _filename], _goos)
-				let donotedit = base.#doNotEditMessage & {#generatedBy: "internal/ci/ci_tool.cue", _}
-				contents: "# \(donotedit)\n\n\(yaml.Marshal(_workflow))"
-			}
+command: gen: workflows: {
+	for _workflowName, _workflow in github.workflows {
+		let _filename = _workflowName + ".yml"
+		(_filename): file.Create & {
+			_dir:     path.FromSlash("../../.github/workflows", path.Unix)
+			filename: path.Join([_dir, _filename], _goos)
+			let donotedit = base.#doNotEditMessage & {#generatedBy: "internal/ci/ci_tool.cue", _}
+			contents: "# \(donotedit)\n\n\(yaml.Marshal(_workflow))"
 		}
 	}
 }