Disable GHA workflows on non-SciTools branches (#4444)

* Prevent automatic refresh lockfiles

* Include stale and benchmark checks

* Move within individual jobs

* Catch one in stale.yml too

* Reverted a newline and added whatsnew

.github/workflows/benchmark.yml

@@ -8,6 +8,7 @@ on:
 
 jobs:
   benchmark:
+    if: "github.repository == 'SciTools/iris'"
     runs-on: ubuntu-latest
 
     env:

.github/workflows/refresh-lockfiles.yml

@@ -28,6 +28,7 @@ on:
 jobs:
 
   no_clobber:
+    if: "github.repository == 'SciTools/iris'"
     runs-on: ubuntu-latest
     steps:
       # check if the auto-update-lockfiles branch exists.  If it does, and someone other than
@@ -64,6 +65,7 @@ jobs:
     # this list below should be changed when covering more python versions
     # TODO: generate this matrix automatically from the list of available py**.yml files
     #       ref: https://tomasvotruba.com/blog/2020/11/16/how-to-make-dynamic-matrix-in-github-actions/
+    if: "github.repository == 'SciTools/iris'"
     runs-on: ubuntu-latest
     needs: no_clobber
 
@@ -89,6 +91,7 @@ jobs:
   create_pr:
     # once the matrix job has completed all the lock files will have been uploaded as artifacts.
     # Download the artifacts, add them to the repo, and create a PR.
+    if: "github.repository == 'SciTools/iris'"
     runs-on: ubuntu-latest
     needs: gen_lockfiles
 

.github/workflows/stale.yml

@@ -7,6 +7,7 @@ on:
 
 jobs:
   stale:
+    if: "github.repository == 'SciTools/iris'"
     runs-on: ubuntu-latest
     steps:
       - uses: actions/stale@v4.0.0

docs/src/whatsnew/latest.rst

@@ -240,6 +240,9 @@ This document explains the changes made to Iris for this release
    `dask-core` in testing environments reducing the number of dependencies
    installed for testing. (:pull:`4434`)
 
+#. `@wjbenfold`_ prevented github action runs in forks (:issue:`4441`,
+   :pull:`4444`)
+
 .. comment
     Whatsnew author names (@github name) in alphabetical order. Note that,
     core dev names are automatically included by the common_links.inc: