Add git-fleximod test Github Action.

Author: nusbaume

.github/workflows/fleximod_test.yaml

@@ -0,0 +1,77 @@
+#Github Action to ensure that
+#the "fxtag" and "url" values
+#in the ".gitmodules" file
+#match what is actually
+#stored in the committed
+#git submodule entries.
+
+#Please note that 'git-fleximod'
+#is not actually needed for this
+#repo, it is simply being used
+#here to run the test described
+#above.
+
+#on: pull_request
+on:
+  push:
+    branches:
+      - fleximod_test
+  pull_request:
+
+jobs:
+  fleximod-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout atmospheric_physics
+        uses: actions/checkout@v4
+
+      - name: checkout python v3.12
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.12"
+
+      - name: checkout git-fleximod
+        use: actions/checkout@v4
+        with:
+          repository: ESMCI/git-fleximod
+          ref: main
+          path: $GITHUB_WORKSPACE/.lib/git-fleximod
+
+      - name: create git-fleximod script
+        run:
+          echo
+          echo "Creating git-fleximod python srcript..."
+
+          #Create new directory:
+          mkdir $GITHUB_WORKSPACE/bin
+
+          #Write python script to expected location:
+          cat <<EOF > $GITHUB_WORKSPACE/bin/git-fleximod
+          #!/usr/bin/env python3
+          import sys
+          import os
+          sys.path.insert(0,os.path.abspath(os.path.join(os.path.dirname(__file__),"..",".lib","git-fleximod")))
+          from git_fleximod.git_fleximod import main
+
+          if __name__ == '__main__':
+              sys.exit(main())
+          EOF
+
+          #Make sure python script is executable:
+          chmod a+x $GITHUB_WORKSPACE/bin/git-fleximod
+
+          echo "...git-fleximod python script generated."
+
+      - name: run git-fleximod
+        run: |
+          $GITHUB_WORKSPACE/bin/git-fleximod update -o
+          echo
+          echo "Update complete, checking status"
+          echo
+          $GITHUB_WORKSPACE/bin/git-fleximod test
+      - name: check cleanliness
+        run: |
+          echo
+          echo "Checking if git fleximod matches expected externals"
+          echo
+          git add . && git diff --exit-code && git diff --cached --exit-code