Adapt build_loop.yml and update.yml to be run in an "actions" branch

to be set as default, and used to trigger scheduled builds of the main branch. 

Empty commits are added to an "actions" branch only (must be created by the user and set as default) to keep this branch "alive" and allow scheduled workflows to run uninterrupted (max 60 days of inactivity). 

The empty commits will not be included in the resulting TestFlight builds of main.

Removed conditionals regarding LoopKit repository.

Author: bjornoleh

.github/workflows/build_loop.yml

@@ -2,18 +2,15 @@ name: 4. Build Loop
 run-name: Build Loop
 on:
   workflow_dispatch:
+  workflow_call:
 
   ## Remove the "#" sign from the beginning of the line below to get automated builds on push (code changes in your repository)
   #push:
 
-  ## Remove the "#" sign from the beginning of the two lines below to get automated builds every month
-  #schedule:
-    #- cron: '0 17 1 * *' # Runs at 17:00 UTC on the 1st in every month.
-
 env:
   UPSTREAM_REPO: LoopKit/LoopWorkspace
-  UPSTREAM_BRANCH: main
-  TARGET_BRANCH: main
+  UPSTREAM_BRANCH: main # upstream branch to sync from
+  TARGET_BRANCH: main # branch on fork to build from
   SYNC_UPSTREAM: 'true' # set to 'false' or 'true' to disable / enable syncing of fork with upstream repository
 
 jobs:

.github/workflows/update.yml

@@ -1,16 +1,22 @@
 name: 'Auto-update'
 
+# Runs only on schedule for the default branch
+# TARGET_BRANCH should be set as default
+# Syncs the target branch with upstream
+# Checks for activity and creates empty commits to TARGET_BRANCH as needed after 'time_elapsed' days of inactivity
+# Launches the build workflow if new commits are found.
+# The build workflow syncs and builds the main branch and uploads to TestFlight
+
 on:
+  workflow_dispatch:
   schedule:
     - cron:  '0 7 * * 1,4'
     # scheduled at 07:00 every Monday and Thursday
 
-  workflow_dispatch:  # click the button on Github repo!
-
 env:
   UPSTREAM_REPO: LoopKit/LoopWorkspace
   UPSTREAM_BRANCH: main
-  TARGET_BRANCH: main
+  TARGET_BRANCH: actions # target branch on fork to be kept "alive" for running scheduled workflows (repo activity required at least every 60 days for scheduled workflows to remain active)
 
 jobs:
   check_latest_from_upstream:
@@ -33,7 +39,6 @@ jobs:
     # REQUIRED step
     # Step 2: run the sync action
     - name: Sync upstream changes
-      if: (github.repository_owner != 'LoopKit')
       id: sync
       uses: aormsby/Fork-Sync-With-Upstream-action@v3.4
       with:
@@ -59,16 +64,16 @@ jobs:
         echo ${{ steps.sync.outputs.has_new_commits }}
         echo "NEW_COMMITS=${{ steps.sync.outputs.has_new_commits }}" >> $GITHUB_OUTPUT
         
-    # Keep upstream repository "alive": add empty commits after "time_elapsed" days to avoid inactivation of scheduled workflows
+    # Keep repository "alive": add empty commits to TARGET_BRANCH after "time_elapsed" days of inactivity to avoid inactivation of scheduled workflows
     - name: Keep alive
-      if: (github.ref == 'refs/heads/main' && github.repository_owner == 'LoopKit')
+      if: github.ref == 'refs/heads/${{ env.TARGET_BRANCH }}'
       uses: gautamkrishnar/keepalive-workflow@v1 # using the workflow with default settings
       with:
         time_elapsed: 27 # Time elapsed from the previous commit to trigger a new automated commit (in days)
 
   # Launch build workflow if new commits are found
   launch_build_workflow:
-    if: needs.check_latest_from_upstream.outputs.NEW_COMMITS == 'true' && (github.repository_owner != 'LoopKit')
+    if: needs.check_latest_from_upstream.outputs.NEW_COMMITS == 'true'
     needs: check_latest_from_upstream
     name: Launch build workflow
     uses: ./.github/workflows/build_loop.yml