feat: implement basic feature working for Linux only

src/install.ts

@@ -0,0 +1,26 @@
+import {exec} from '@actions/exec'
+import {downloadTool} from '@actions/tool-cache'
+
+export async function runCommand(command: string): Promise<string> {
+  let output = ''
+  const result = await exec(command, [], {
+    listeners: {
+      stdout: (data: Buffer) => {
+        output += data.toString()
+      }
+    }
+  })
+  if (result !== 0) {
+    throw new Error(`Failed to run command: ${command}`)
+  }
+  return output.trim()
+}
+
+export async function install(version: string): Promise<string> {
+  const system = runCommand('uname -s')
+  const hardware = runCommand('uname -m')
+  const url = `https://github.com/docker/compose/releases/download/${version}/docker-compose-${await system}-${await hardware}`
+  const installerPath = await downloadTool(url)
+  await exec(`chmod +x ${installerPath}`)
+  return installerPath
+}

src/main.ts

@@ -1,16 +1,13 @@
 import * as core from '@actions/core'
-import {wait} from './wait'
+import {install} from './install'
 
 async function run(): Promise<void> {
   try {
-    const ms: string = core.getInput('milliseconds')
-    core.debug(`Waiting ${ms} milliseconds ...`) // debug is only output if you set the secret `ACTIONS_RUNNER_DEBUG` to true
-
-    core.debug(new Date().toTimeString())
-    await wait(parseInt(ms, 10))
-    core.debug(new Date().toTimeString())
-
-    core.setOutput('time', new Date().toTimeString())
+    const version: string = core.getInput('verison', {
+      required: true
+    })
+    const commandPath = await install(version)
+    core.addPath(commandPath)
   } catch (error) {
     core.setFailed(error.message)
   }

src/wait.ts

@@ -1,9 +0,0 @@
-export async function wait(milliseconds: number): Promise<string> {
-  return new Promise(resolve => {
-    if (isNaN(milliseconds)) {
-      throw new Error('milliseconds not a number')
-    }
-
-    setTimeout(() => resolve('done!'), milliseconds)
-  })
-}