Limit action to ubuntu virt env.

.github/workflows/main.yml

@@ -8,6 +8,7 @@ jobs:
         with:
           dfx-version: 0.7.1
           vessel-version: 0.6.1
-      - run: dfx --version
-      - run: moc --version
-      - run: vessel --version
+      - run: |
+          dfx --version
+          moc --version
+          vessel --version

README.md

@@ -2,17 +2,22 @@
 
 This action sets up a dfx environment, also includes `moc`.
 
+**!** Only supports Ubuntu virtual environments.
+
 ## Usage
 
 ```yml
+runs-on: ubuntu-latest
 steps:
 - uses: actions/checkout@v2
 - uses: allusion-be/setup-dfx@main
   with:
     dfx-version: 0.7.1
+    vessel-version: 0.6.1
 - run: |
     dfx --version
     moc --version
+    vessel --version
 ```
 
 ## Possible Improvements

dist/index.js

@@ -42,8 +42,13 @@ exports.run = void 0;
 const core = __importStar(__nccwpck_require__(186));
 const io = __importStar(__nccwpck_require__(436));
 const child_process_1 = __importDefault(__nccwpck_require__(129));
+const os_1 = __importDefault(__nccwpck_require__(87));
 function run() {
     return __awaiter(this, void 0, void 0, function* () {
+        if (os_1.default.platform() !== 'linux') {
+            core.setFailed(`Action not supported for: ${os_1.default.platform()} ${os_1.default.arch()}.`);
+            return;
+        }
         try {
             let dfxVersion = core.getInput('dfx-version');
             core.info(`Setup dfx version ${dfxVersion}`);

src/main.ts

@@ -1,8 +1,14 @@
 import * as core from '@actions/core';
 import * as io from '@actions/io';
 import cp from 'child_process';
+import os from 'os';
 
 export async function run() {
+    if (os.platform() !== 'linux') {
+        core.setFailed(`Action not supported for: ${os.platform()} ${os.arch()}.`)
+        return;
+    }
+
     try {
         let dfxVersion = core.getInput('dfx-version');
         core.info(`Setup dfx version ${dfxVersion}`);