ci: install GCC 14 and use it on nowallet depends and build

Author: kwvg

ci/test/00_setup_env_native_nowallet.sh

@@ -9,6 +9,6 @@ export LC_ALL=C.UTF-8
 export CONTAINER_NAME=ci_native_nowallet
 export HOST=x86_64-pc-linux-gnu
 export PACKAGES="python3-zmq"
-export DEP_OPTS="NO_WALLET=1"
+export DEP_OPTS="NO_WALLET=1 CC=gcc-14 CXX=g++-14"
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-reduce-exports --with-boost-process"
+export BITCOIN_CONFIG="--enable-reduce-exports --with-boost-process CC=gcc-14 CXX=g++-14"

contrib/containers/ci/Dockerfile

@@ -171,6 +171,7 @@ RUN set -ex; \
 RUN apt-get update && apt-get install $APT_ARGS \
     bc \
     gawk \
+    g++-14 \
     g++-arm-linux-gnueabihf \
     g++-mingw-w64-x86-64 \
     jq \