internal/ci: start publishing the module

We need to declare the source kind, and the language version
should be v0.13 as some of the other repos use the stable version.

Signed-off-by: Daniel Martí <[email protected]>
Change-Id: I2e5463d8b6a1d328a34b95667b412f17fb395b5e
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1218688
TryBot-Result: CUEcueckoo <[email protected]>
Unity-Result: CUE porcuepine <[email protected]>
Reviewed-by: Paul Jolly <[email protected]>

Author: mvdan

internal/ci/cue.mod/module.cue

@@ -1,6 +1,9 @@
 module: "github.com/cue-lang/tmp/internal/ci"
 language: {
-	version: "v0.14.0"
+	version: "v0.13.0"
+}
+source: {
+	kind: "self"
 }
 deps: {
 	"cue.dev/x/githubactions@v0": {