ci: extract pip bootstrapping into compilation/ensure_pip.py to fix yaml scalar parsing

compilation/ensure_pip.py

@@ -0,0 +1,41 @@
+import sys
+import subprocess
+import urllib.request
+
+def main():
+    try:
+        import pip  # noqa: F401
+        print("[+] pip is already installed.")
+        return
+    except ImportError:
+        pass
+
+    try:
+        import ensurepip
+        ensurepip.bootstrap()
+        print("[+] Successfully bootstrapped pip via ensurepip.")
+        return
+    except Exception as e:
+        print(f"[*] ensurepip bootstrap skipped ({e}), downloading get-pip.py...")
+
+    ver = f"{sys.version_info.major}.{sys.version_info.minor}"
+    url = f"https://bootstrap.pypa.io/pip/{ver}/get-pip.py" if sys.version_info < (3, 10) else "https://bootstrap.pypa.io/get-pip.py"
+    dest = "/tmp/get-pip.py" if sys.platform != "win32" else "get-pip.py"
+    
+    print(f"[*] Downloading get-pip.py from {url} for Python {ver}...")
+    try:
+        urllib.request.urlretrieve(url, dest)
+        cmd = [sys.executable, dest]
+        if sys.version_info >= (3, 11):
+            cmd.append("--break-system-packages")
+        res = subprocess.run(cmd)
+        if res.returncode == 0:
+            print("[+] Successfully installed pip via get-pip.py")
+        else:
+            # Retry without break-system-packages in case old pip version rejected it
+            subprocess.run([sys.executable, dest])
+    except Exception as ex:
+        print(f"[!] Warning during pip bootstrap: {ex}")
+
+if __name__ == "__main__":
+    main()