MOBILE-4110 ci: Fix behat plugin diff calculation

.github/scripts/functions.sh

@@ -65,10 +65,15 @@ function notify_on_error_exit {
 }
 
 function get_behat_plugin_changes_diff {
-    i=0
-    previoushash=""
+    # Grab hashes from app repository
     currenthash=`git rev-parse HEAD`
     initialhash=`git rev-list HEAD | tail -n 1`
+
+    # Move into plugin repository to find previous hash
+    cd tmp/local_moodleappbehat
+
+    i=0
+    previoushash=""
     totalcommits=`git log --oneline | wc -l`
     repositoryname=`echo $GITHUB_REPOSITORY | sed "s/\\//\\\\\\\\\\//"`
 

.github/scripts/update_behat_plugin.sh

@@ -47,10 +47,10 @@ sed -i s/\$plugin-\>version\ =\ [0-9]\\+\;/\$plugin-\>version\ =\ $newpluginvers
 # Apply new changes
 print_title "Applying changes to repository..."
 
-cd tmp/local_moodleappbehat
-
 diff=`get_behat_plugin_changes_diff`
 
+cd tmp/local_moodleappbehat
+
 # Set up Github Actions bot user
 # See https://github.community/t/github-actions-bot-email-address/17204/6
 git config --local user.email "41898282+github-actions[bot]@users.noreply.github.com"