Workflow to write the date, once a day (#1504)

* Add date workflow

* add files

* use VCS_DATE in engine controller

* initial values

* switched to using one file

* moved to controllers

* Add comment and fix cron entry

* add pragma once

* Add more comments

.github/workflows/set-date.yaml

@@ -0,0 +1,34 @@
+name: Set Date
+
+# Run once every day
+# If we run it on schedule, but only change the date stamp if the repo has changed, The date could be behind by up to a day.
+# We can't really try to change it with every push the way workflows are set up now,
+#  because there is no way to control which workflows run first, so some builds will not have the updated date and will lag behind by one build.
+# https://help.github.com/en/actions/reference/events-that-trigger-workflows#triggering-new-workflows-using-a-personal-access-token
+#  "When you use the repository's GITHUB_TOKEN to perform tasks on behalf of the GitHub Actions app,
+#  events triggered by the GITHUB_TOKEN will not create a new workflow run."
+on:
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  update-date:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Write Date File
+      run: |
+        echo -e -n "#pragma once\n#ifndef VCS_DATE\n#define VCS_DATE $(date "+%Y%m%d")\n#endif" > ./firmware/controllers/date_stamp.h
+        git config --local user.email "action@github.com"
+        git config --local user.name "GitHub Action"
+        git commit -m "Update date" -a 2>&1 | grep -E '(nothing to commit|changed)'
+
+    - name: Push changed date file
+      uses: ad-m/github-push-action@master
+      with:
+        github_token: ${{ github.token }}
+        branch: master

firmware/controllers/date_stamp.h

@@ -0,0 +1,3 @@
+#ifndef VCS_DATE
+#define VCS_DATE 20200617
+#endif

firmware/controllers/engine_controller.cpp

@@ -56,6 +56,7 @@
 #include "launch_control.h"
 #include "tachometer.h"
 #include "gppwm.h"
+#include "date_stamp.h"
 
 #if EFI_SENSOR_CHART
 #include "sensor_chart.h"
@@ -716,6 +717,6 @@ int getRusEfiVersion(void) {
 	if (initBootloader() != 0)
 		return 123;
 #endif /* EFI_BOOTLOADER_INCLUDE_CODE */
-	return 20200614;
+	return VCS_DATE;
 }
 #endif /* EFI_UNIT_TEST */