Allow Running Container as Runner Host User (#600)

- Added `runAsHostUser` to allow running the container as the same user as the host system. This fixes most permissions issues on self-hosted runners.
- Perform android sdk setup during entrypoint.sh to ensure it has root permissions if the user switches to a non-root user
- Automatically detect android sdk target version if parameters are not already provided to configure the sdk
- Generate a new uuid for machineID to ensure separate containers are unique to reduce license activation errors
- Add exponential retry strategy for Ubuntu license activations

src/model/input.ts

@@ -193,6 +193,10 @@ class Input {
     return Input.getInput('gitPrivateToken');
   }
 
+  static get runAsHostUser(): string {
+    return Input.getInput('runAsHostUser') || 'false';
+  }
+
   static get chownFilesTo() {
     return Input.getInput('chownFilesTo') || '';
   }