F-Droid build failed

[linsui]

Execution failed for task ':app:lintVitalRelease'.
> Lint found fatal errors while assembling a release target.
  
  Fix the issues identified by lint, or create a baseline to see only new errors.
  To create a baseline, run `gradlew updateLintBaseline` after adding the following to the module's build.gradle file:
  ```
  android {
      lint {
          baseline = file("lint-baseline.xml")
      }
  }
  ```
  For more details, see https://developer.android.com/studio/write/lint#snapshot
  
  /home/vagrant/build/com.dynamite.heaterrc/app/src/main/AndroidManifest.xml:14: Error: AlarmReceiver must extend android.content.BroadcastReceiver [Instantiatable]
              android:name=".AlarmReceiver"
                            ~~~~~~~~~~~~~~
  
     Explanation for issues of type "Instantiatable":
     Activities, services, broadcast receivers etc. registered in the manifest
     file (or for custom views, in a layout file) must be "instantiatable" by
     the system, which means that the class must be public, it must have an
     empty public constructor, and if it's an inner class, it must be a static
     inner class.
  
     If you use a custom AppComponentFactory to instantiate app components
     yourself, consider disabling this Lint issue in order to avoid false
     positives.
  
  1 errors, 0 warnings
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BUILD FAILED in 18s

Could you please take a look? Thanks!