Add force-avd-creation to skip avd creation if avd with same name exists. Update workflow to test snapshot caching.

lib/sdk-installer.js

@@ -57,6 +57,8 @@ function installAndroidSdk(apiLevel, target, arch, emulatorBuild, ndkVersion, cm
         }
         // add paths for commandline-tools and platform-tools
         core.addPath(`${cmdlineToolsPath}/latest:${cmdlineToolsPath}/latest/bin:${process.env.ANDROID_SDK_ROOT}/platform-tools`);
+        // set standard AVD path
+        core.exportVariable('ANDROID_AVD_HOME', `${process.env.HOME}/.android/avd`);
         // additional permission and license requirements for Linux
         const sdkPreviewLicensePath = `${process.env.ANDROID_SDK_ROOT}/licenses/android-sdk-preview-license`;
         if (!isOnMac && !fs.existsSync(sdkPreviewLicensePath)) {