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
+}