fix: Add recursive clone for libdatachannel submodules in WebRTC builds

- Fix libdatachannel dependency build failures by using --recursive clone
- Ensure all git submodules (plog, usrsctp, libsrtp, libjuice, json) are properly initialized
- Apply fix to all WebRTC build jobs: Linux, Windows (32/64), macOS (ARM64/x86_64)
- Resolve CMake errors about missing CMakeLists.txt files in deps/ directories

This fixes the WebRTC build failures where libdatachannel dependencies
were missing due to uninitialized git submodules, ensuring all WebRTC
builds can complete successfully across all platforms.

Author: nguyendkn

.github/workflows/release.yml

@@ -99,7 +99,7 @@ jobs:
 
       - name: Build and install libdatachannel
         run: |
-          git clone https://github.com/paullouisageneau/libdatachannel.git
+          git clone --recursive https://github.com/paullouisageneau/libdatachannel.git
           cd libdatachannel
           cmake -B build -DUSE_GNUTLS=0 -DUSE_NICE=0 -DCMAKE_BUILD_TYPE=Release
           cmake --build build
@@ -135,7 +135,7 @@ jobs:
 
       - name: Build and install libdatachannel
         run: |
-          git clone https://github.com/paullouisageneau/libdatachannel.git
+          git clone --recursive https://github.com/paullouisageneau/libdatachannel.git
           cd libdatachannel
           cmake -B build -DUSE_GNUTLS=0 -DUSE_NICE=0 -DCMAKE_BUILD_TYPE=Release
           cmake --build build
@@ -183,7 +183,7 @@ jobs:
 
       - name: Build and install libdatachannel
         run: |
-          git clone https://github.com/paullouisageneau/libdatachannel.git
+          git clone --recursive https://github.com/paullouisageneau/libdatachannel.git
           cd libdatachannel
           cmake -B build -DUSE_GNUTLS=0 -DUSE_NICE=0 -DCMAKE_BUILD_TYPE=Release
           cmake --build build
@@ -260,7 +260,7 @@ jobs:
 
       - name: Build and install libdatachannel for cross-compilation
         run: |
-          git clone https://github.com/paullouisageneau/libdatachannel.git
+          git clone --recursive https://github.com/paullouisageneau/libdatachannel.git
           cd libdatachannel
           # Cross-compile for Windows 32-bit
           cmake -B build-win32 \
@@ -361,7 +361,7 @@ jobs:
 
       - name: Build and install libdatachannel for cross-compilation
         run: |
-          git clone https://github.com/paullouisageneau/libdatachannel.git
+          git clone --recursive https://github.com/paullouisageneau/libdatachannel.git
           cd libdatachannel
           # Cross-compile for Windows 64-bit
           cmake -B build-win64 \
@@ -481,7 +481,7 @@ jobs:
 
       - name: Build and install libdatachannel
         run: |
-          git clone https://github.com/paullouisageneau/libdatachannel.git
+          git clone --recursive https://github.com/paullouisageneau/libdatachannel.git
           cd libdatachannel
           cmake -B build -DUSE_GNUTLS=0 -DUSE_NICE=0 -DCMAKE_BUILD_TYPE=Release
           cmake --build build
@@ -594,7 +594,7 @@ jobs:
 
       - name: Build and install libdatachannel
         run: |
-          git clone https://github.com/paullouisageneau/libdatachannel.git
+          git clone --recursive https://github.com/paullouisageneau/libdatachannel.git
           cd libdatachannel
           cmake -B build -DUSE_GNUTLS=0 -DUSE_NICE=0 -DCMAKE_BUILD_TYPE=Release
           cmake --build build