[alt-builder] Add pkgconfig

alt-builder/Dockerfile

@@ -8,7 +8,7 @@ RUN apt-get update && apt-get install -y wget gnupg && \
     \
     apt-get update && \
     apt-get install -y g++ g++-11 \
-                       cmake ninja-build python3 \
+                       cmake ninja-build python3 pkg-config \
                        clang++-13 lld-13 libc++abi1-13 libc++abi-13-dev libc++1-13 libc++-13-dev \
                        jq clang-tidy-13 cppcheck \
                        clang-format-13 \