feat(apisix): add Cloudron package

- Implements Apache APISIX packaging for Cloudron platform.
- Includes Dockerfile, CloudronManifest.json, and start.sh.
- Configured to use Cloudron's etcd addon.

🤖 Generated with Gemini CLI
Co-Authored-By: Gemini <noreply@google.com>

CloudronPackages/APISIX/apisix-source/t/certs/public.pem

@@ -0,0 +1,9 @@
+-----BEGIN PUBLIC KEY-----
+MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA79XYBopfnVMKxI533oU2
+VFQbEdSPtWRD+xSl73lHLVboGP1lSIZtnEj5AcTN2uDW6AYPiWL2iA3lEEsDTs7J
+BUXyl6pysBPfrqC8n/MOXKaD4e8U5GAHFiwHWg2WzHlfFSlFkLjzp0vPkDK+fQ4C
+lrd7shAyitB7use6DHcVCKuI4bFOoFbdI5sBGeyoD833g+ql9bRkH/vf8O+rPwHA
+M+47r1iv3lY3ex0P45PRd7U7rq8P8UIw6qOI1tiYuKlFJmjFdcwtYG0dctxWwgL1
++7njrVQoWvuOTSsc9TDMhZkmmSsU3wXjaPxJpydck1C/w9ZLqsctKK5swYWhIcbc
+BQIDAQAB
+-----END PUBLIC KEY-----