Refactor action to typescript (#226)

* Refactor to typescript (config part)

* Refactor to typescript (convert extensions, minor fixes)

* Refactor to typescript (move from `action` to `dist`)

* Re-enable integrity-check for dist index.js

* Fix all tests and lints

* fix parsing major versions

* Test patch level to be digits only

* debug

* debug

* uncache

* manual compile

* debug

* debug

* Debug

* Build lib - doh

* remove diff check

* Make kubernetes workflow manual

* Properly generate 3 digit for simple major tags

* Remove ts-ignore

* re-enable cache

src/model/action.ts

@@ -0,0 +1,48 @@
+import path from 'path';
+
+class Action {
+  static get supportedPlatforms() {
+    return ['linux'];
+  }
+
+  static get isRunningLocally() {
+    return process.env.RUNNER_WORKSPACE === undefined;
+  }
+
+  static get isRunningFromSource() {
+    return path.basename(__dirname) === 'model';
+  }
+
+  static get canonicalName() {
+    return 'unity-builder';
+  }
+
+  static get rootFolder() {
+    if (Action.isRunningFromSource) {
+      return path.dirname(path.dirname(path.dirname(__filename)));
+    }
+
+    return path.dirname(path.dirname(__filename));
+  }
+
+  static get actionFolder() {
+    return `${Action.rootFolder}/dist`;
+  }
+
+  static get dockerfile() {
+    return `${Action.actionFolder}/Dockerfile`;
+  }
+
+  static get workspace() {
+    return process.env.GITHUB_WORKSPACE;
+  }
+
+  static checkCompatibility() {
+    const currentPlatform = process.platform;
+    if (!Action.supportedPlatforms.includes(currentPlatform)) {
+      throw new Error(`Currently ${currentPlatform}-platform is not supported`);
+    }
+  }
+}
+
+export default Action;