Add prototype action using exec and curl

* Downloads a fixed version Julia binary using curl
* Adds it to PATH
* Runs `julia --version` to test the installation

src/main.ts

@@ -1,12 +0,0 @@
-import * as core from '@actions/core';
-
-async function run() {
-  try {
-    const myInput = core.getInput('myInput');
-    core.debug(`Hello ${myInput}`);
-  } catch (error) {
-    core.setFailed(error.message);
-  }
-}
-
-run();

src/setup-julia.ts

@@ -0,0 +1,32 @@
+import * as core from "@actions/core";
+import * as exec from "@actions/exec";
+
+import * as os from "os";
+
+async function run() {
+  try {
+    const version = core.getInput("version");
+    core.debug(`selected Julia version: ${version}`);
+
+    // Store information about the environment
+    const osPlat = os.platform();
+    const osArch = os.arch();
+
+    // For now, just download Linux x64 binaries
+    await exec.exec("curl", [
+      "-O",
+      "https://julialang-s3.julialang.org/bin/linux/x64/1.0/julia-1.0.1-linux-x86_64.tar.gz"
+    ]);
+    await exec.exec("tar xf julia-1.0.1-linux-x86_64.tar.gz");
+
+    // Add the downloaded binary to path
+    core.addPath("julia-1.0.1/bin");
+
+    // Test if it worked
+    await exec.exec("julia", ["--version"]);
+  } catch (error) {
+    core.setFailed(error.message);
+  }
+}
+
+run();