try to build b2 from source

Author: lia-viam

.github/workflows/conan.yml

@@ -159,6 +159,8 @@ jobs:
             platform: linux_x86_64-debian-bookworm
             image: debian:bookworm
             runs_on: buildjet-8vcpu-ubuntu-2204
+    env:
+      MATRIX_TARGET: ${{ matrix.target }}
 
     steps:
       - name: Checkout Code
@@ -208,4 +210,13 @@ jobs:
 
           pip install conan
           conan profile detect
+
+          if [[ ${MATRIX_TARGET} = "x86_64-debian-bullseye" ]]
+          then
+            mkdir b2-tmp
+            echo "[requires]\nb2/5.3.2\n" > b2-tmp/conanfile.txt
+            conan install b2-tmp --build=missing -s compiler.cppstd=14 -s:a compiler.cppstd=14
+            rm -r b2-tmp
+          fi
+
           conan create . --build=missing -s compiler.cppstd=14 -s:a compiler.cppstd=14