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

dist/BlankProject/ProjectSettings/XRSettings.asset

@@ -1,10 +0,0 @@
-{
-    "m_SettingKeys": [
-        "VR Device Disabled",
-        "VR Device User Alert"
-    ],
-    "m_SettingValues": [
-        "False",
-        "False"
-    ]
-}