test: Add workaround for zinit installation in tests

- Added a workaround to download and execute zinit if it's not found in the path.
- This is necessary because the zinit installer cannot be imported due to a circular dependency.
- This ensures that the tests can run reliably even without zinit being pre-installed.

Co-authored-by: mahmmoud.hassanein <mahmmoud.hassanein@gmail.com>

lib/osal/zinit/rpc_test.v

@@ -2,11 +2,35 @@ module zinit
 
 import os
 import time
+import freeflowuniverse.herolib.core
+import freeflowuniverse.herolib.osal
 
 fn test_zinit() {
+	if !core.is_linux()! {
+		// zinit is only supported on linux
+		return
+	}
+
+	// TODO: use zinit installer to install zinit
+	// this is a workaround since we can't import zinit installer due to circular dependency
+	zinit_version := os.execute('zinit --version')
+	if zinit_version.exit_code != 0 {
+		release_url := 'https://github.com/threefoldtech/zinit/releases/download/v0.2.14/zinit'
+
+		mut dest := osal.download(
+			url:        release_url
+			minsize_kb: 2000
+			reset:      true
+			dest:       '/tmp/zinit'
+		)!
+
+		chmod_cmd := os.execute('chmod +x /tmp/zinit')
+		assert chmod_cmd.exit_code == 0, 'failed to chmod +x /tmp/zinit: ${chmod_cmd.output}'
+	}
+
 	this_dir := os.dir(@FILE)
 	// you need to have zinit in your path to run this test
-	spawn os.execute('zinit -s ${this_dir}/zinit/zinit.sock init -c ${this_dir}/zinit')
+	spawn os.execute('/tmp/zinit -s ${this_dir}/zinit/zinit.sock init -c ${this_dir}/zinit')
 	time.sleep(time.second)
 
 	client := new_rpc_client(socket_path: '${this_dir}/zinit/zinit.sock')