ci: increase git cloning depth to 100 (#4481)

* ci: increase git cloning depth to 100

* check_runtime: verify shallow git clones to contain origin/master

* check_runtime: fetch master branch

substrate/.gitlab-ci.yml

@@ -15,7 +15,7 @@ stages:
 
 variables:
   GIT_STRATEGY:                    fetch
-  GIT_DEPTH:                       "3"
+  GIT_DEPTH:                       100
   CARGO_HOME:                      "/ci-cache/${CI_PROJECT_NAME}/cargo/${CI_JOB_NAME}"
   SCCACHE_DIR:                     "/ci-cache/${CI_PROJECT_NAME}/sccache"
   CARGO_INCREMENTAL:               0

substrate/.maintain/gitlab/check_runtime.sh

@@ -27,6 +27,15 @@ github_label () {
 
 
 
+git fetch --depth=${GIT_DEPTH:-100} origin master
+
+# check if master is part of this checkout
+if ! git log -n 1 origin/master
+then
+	echo "unable to check for runtime changes: checkout does not contain origin/master branch"
+	exit 3
+fi
+
 # check if the wasm sources changed
 if ! git diff --name-only origin/master...${CI_COMMIT_SHA} \
 	| grep -q -e '^bin/node/src/runtime' -e '^frame/' -e '^primitives/sr-' | grep -v -e '^primitives/sr-arithmetic/fuzzer'