internal/_e2e: fix end to end tests to set source

The end-to-end tests had not been updated to
set the now-mandatory source field.

Signed-off-by: Roger Peppe <rogpeppe@gmail.com>
Change-Id: Ibc63df5a90f5a4c5f191a5f4c7f8a9a335ed76ff
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1193382
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>

internal/_e2e/testdata/script/gcloud_upload.txtar

@@ -12,12 +12,14 @@ env MODVER=${MODULE}@v0
 cd publish
 
 exec cue mod init ${MODVER}
+exec cue mod edit --source self
 exec cue mod publish ${VERSION}
 
 cd ../depend
 
 env-fill out_foo.cue
 exec cue mod init depend.localhost
+exec cue mod edit --source self
 exec cue mod tidy
 exec cue export
 cmp stdout export.golden

internal/_e2e/testdata/script/github_app_private.txtar

@@ -10,12 +10,14 @@ env MODVER=${MODULE}@v0
 cd publish
 
 exec cue mod init ${MODVER}
+exec cue mod edit --source self
 exec cue mod publish ${VERSION}
 
 cd ../depend
 
 env-fill out_foo.cue
 exec cue mod init depend.localhost
+exec cue mod edit --source self
 exec cue mod tidy
 exec cue export
 cmp stdout export.golden

internal/_e2e/testdata/script/github_app_public.txtar

@@ -10,12 +10,14 @@ env MODVER=${MODULE}@v0
 cd publish
 
 exec cue mod init ${MODVER}
+exec cue mod edit --source self
 exec cue mod publish ${VERSION}
 
 cd ../depend
 
 env-fill out_foo.cue
 exec cue mod init depend.localhost
+exec cue mod edit --source self
 exec cue mod tidy
 exec cue export
 cmp stdout export.golden