[202505] Add sonic_release file for 202505 and lock down sub modules (#22635)

Why I did it
Add sonic_release file for 202505

Work item tracking
Microsoft ADO (number only):
32912687
How I did it
Add sonic_release file for 202505

Author: yejianquan

.gitmodules

@@ -1,15 +1,19 @@
 [submodule "sonic-swss-common"]
 	path = src/sonic-swss-common
 	url = https://github.com/sonic-net/sonic-swss-common
+	branch = 202505
 [submodule "sonic-linux-kernel"]
 	path = src/sonic-linux-kernel
 	url = https://github.com/sonic-net/sonic-linux-kernel
+	branch = 202505
 [submodule "sonic-sairedis"]
 	path = src/sonic-sairedis
 	url = https://github.com/sonic-net/sonic-sairedis
+	branch = 202505
 [submodule "sonic-swss"]
 	path = src/sonic-swss
 	url = https://github.com/sonic-net/sonic-swss
+	branch = 202505
 [submodule "src/p4c-bm/p4c-bm"]
 	path = platform/p4/p4c-bm/p4c-bm
 	url = https://github.com/krambn/p4c-bm
@@ -19,27 +23,33 @@
 [submodule "sonic-dbsyncd"]
 	path = src/sonic-dbsyncd
 	url = https://github.com/sonic-net/sonic-dbsyncd
+	branch = 202505
 [submodule "src/sonic-py-swsssdk"]
 	path = src/sonic-py-swsssdk
 	url = https://github.com/sonic-net/sonic-py-swsssdk.git
+	branch = 202505
 [submodule "src/sonic-snmpagent"]
 	path = src/sonic-snmpagent
 	url = https://github.com/sonic-net/sonic-snmpagent
+	branch = 202505
 [submodule "src/ptf"]
 	path = src/ptf
 	url = https://github.com/p4lang/ptf.git
 [submodule "src/sonic-utilities"]
 	path = src/sonic-utilities
 	url = https://github.com/sonic-net/sonic-utilities
+	branch = 202505
 [submodule "platform/broadcom/sonic-platform-modules-arista"]
 	path = platform/broadcom/sonic-platform-modules-arista
 	url = https://github.com/aristanetworks/sonic
 [submodule "src/sonic-platform-common"]
 	path = src/sonic-platform-common
 	url = https://github.com/sonic-net/sonic-platform-common
+	branch = 202505
 [submodule "src/sonic-platform-daemons"]
 	path = src/sonic-platform-daemons
 	url = https://github.com/sonic-net/sonic-platform-daemons
+	branch = 202505
 [submodule "src/sonic-platform-pde"]
 	path = src/sonic-platform-pde
 	url = https://github.com/sonic-net/sonic-platform-pdk-pde
@@ -68,16 +78,19 @@
 [submodule "src/sonic-mgmt-framework"]
 	path = src/sonic-mgmt-framework
 	url = https://github.com/sonic-net/sonic-mgmt-framework
+	branch = 202505
 [submodule "src/sonic-ztp"]
 	path = src/sonic-ztp
 	url = https://github.com/sonic-net/sonic-ztp
+	branch = 202505
 [submodule "src/sonic-restapi"]
 	path = src/sonic-restapi
 	url = https://github.com/sonic-net/sonic-restapi.git
-	branch = master
+	branch = 202505
 [submodule "src/sonic-mgmt-common"]
 	path = src/sonic-mgmt-common
 	url = https://github.com/sonic-net/sonic-mgmt-common.git
+	branch = 202505
 [submodule "src/wpasupplicant/sonic-wpa-supplicant"]
 	path = src/wpasupplicant/sonic-wpa-supplicant
 	url = https://github.com/sonic-net/sonic-wpa-supplicant.git
@@ -91,6 +104,7 @@
 [submodule "src/linkmgrd"]
 	path = src/linkmgrd
 	url = https://github.com/sonic-net/sonic-linkmgrd.git
+	branch = 202505
 [submodule "src/sonic-p4rt/sonic-pins"]
 	path = src/sonic-p4rt/sonic-pins
 	url = https://github.com/sonic-net/sonic-pins.git
@@ -100,24 +114,30 @@
 [submodule "src/dhcprelay"]
 	path = src/dhcprelay
 	url = https://github.com/sonic-net/sonic-dhcp-relay.git
+	branch = 202505
 [submodule "src/sonic-host-services"]
 	path = src/sonic-host-services
 	url = https://github.com/sonic-net/sonic-host-services
+	branch = 202505
 [submodule "src/sonic-gnmi"]
 	path = src/sonic-gnmi
 	url = https://github.com/sonic-net/sonic-gnmi.git
+	branch = 202505
 [submodule "src/sonic-bmp"]
 	path = src/sonic-bmp
 	url = https://github.com/sonic-net/sonic-bmp.git
+	branch = 202505
 [submodule "src/sonic-genl-packet"]
 	path = src/sonic-genl-packet
 	url = https://github.com/sonic-net/sonic-genl-packet
 [submodule "src/dhcpmon"]
 	path = src/dhcpmon
 	url = https://github.com/sonic-net/sonic-dhcpmon.git
+	branch = 202505
 [submodule "src/sonic-dash-api"]
 	path = src/sonic-dash-api
 	url = https://github.com/sonic-net/sonic-dash-api.git
+	branch = 202505
 [submodule "src/sonic-dash-ha"]
 	path = src/sonic-dash-ha
 	url = https://github.com/sonic-net/sonic-dash-ha

files/image_config/sonic_release

@@ -0,0 +1 @@
+202505