don't fail builds for rustc-guide

Author: mark-i-m

src/ci/docker/x86_64-gnu-tools/checkregression.py

@@ -4,6 +4,9 @@
 import sys
 import json
 
+# Regressions for these tools does not cause failure
+REGRESSION_OK = ["rustc-guide"]
+
 if __name__ == '__main__':
     os_name = sys.argv[1]
     toolstate_file = sys.argv[2]
@@ -32,7 +35,8 @@
                 'The state of "{}" has {} from "{}" to "{}"'
                 .format(tool, verb, state, new_state)
             )
-            regressed = True
+            if tool not in REGRESSION_OK:
+                regressed = True
 
     if regressed:
         sys.exit(1)

src/ci/docker/x86_64-gnu-tools/checktools.sh

@@ -89,7 +89,6 @@ status_check() {
     # these tools are not required for beta to successfully branch
     check_dispatch $1 nightly miri src/tools/miri
     check_dispatch $1 nightly embedded-book src/doc/embedded-book
-    check_dispatch $1 nightly rustc-guide src/doc/rustc-guide
 }
 
 # If this PR is intended to update one of these tools, do not let the build pass