fix: deb package build (XRPLF#4591)

The debug packages were named with the extension ".ddeb", but due to a
bug in Artifactory, they need to have the ".deb" extension. Debug symbol
packages with ".ddeb" extensions are not indexed, and thus are not
visible in apt clients.

* Fix the issue by renaming the debug packages in the build script.
* Use GCC-11 and update GCC Conan profile.
  * This software requires GCC 11 and C++20. However, reporting mode is
    built with C++17.

This is a quick band-aid to fix the build. Later, it will be better to
remove this package-building code.

For context, a Debian (deb) package contains bundled software and
resources necessary for installing and managing software on a
Debian-based system, including Ubuntu and derivatives.

.gitignore

@@ -108,3 +108,4 @@ pkg_out
 pkg
 CMakeUserPresets.json
 bld.rippled/
+.vscode

Builds/containers/packaging/dpkg/build_dpkg.sh

@@ -67,6 +67,10 @@ if [ -e rippled_${RIPPLED_DPKG_FULL_VERSION}_amd64.buildinfo ] ; then
     cp rippled_${RIPPLED_DPKG_FULL_VERSION}_amd64.buildinfo ${PKG_OUTDIR}
 fi
 
+pushd ${PKG_OUTDIR}
+for f in *.ddeb; do mv -- "$f" "${f%.ddeb}.deb"; done
+popd
+
 cat rippled_${RIPPLED_DPKG_FULL_VERSION}_amd64.changes
 # extract the text in the .changes file that appears between
 #    Checksums-Sha256:  ...

Builds/containers/packaging/dpkg/debian/rules

@@ -15,12 +15,25 @@ override_dh_systemd_start:
 	dh_systemd_start --no-restart-on-upgrade
 
 override_dh_auto_configure:
+	apt install --yes gcc-11 g++-11
+	update-alternatives --install \
+		/usr/bin/gcc gcc /usr/bin/gcc-11 100 \
+		--slave /usr/bin/g++ g++ /usr/bin/g++-11 \
+		--slave /usr/bin/gcc-ar gcc-ar /usr/bin/gcc-ar-11 \
+		--slave /usr/bin/gcc-nm gcc-nm /usr/bin/gcc-nm-11 \
+		--slave /usr/bin/gcc-ranlib gcc-ranlib /usr/bin/gcc-ranlib-11 \
+		--slave /usr/bin/gcov gcov /usr/bin/gcov-11 \
+		--slave /usr/bin/gcov-tool gcov-tool /usr/bin/gcov-dump-11 \
+		--slave /usr/bin/gcov-dump gcov-dump /usr/bin/gcov-tool-11
+	update-alternatives --set gcc /usr/bin/gcc-11
 	env
 	rm -rf bld
-
+	conan profile update settings.compiler.cppstd=20 gcc
+	conan profile update settings.compiler.version=11 gcc
 	conan export external/snappy snappy/1.1.9@
 
 	conan install . \
+		--profile gcc \
 		--install-folder bld/rippled  \
 		--build missing \
 		--build boost \
@@ -38,12 +51,14 @@ override_dh_auto_configure:
 		-B bld/rippled
 
 	conan install . \
+		--profile gcc \
 		--install-folder bld/rippled-reporting \
 		--build missing \
 		--build boost \
 		--build sqlite3 \
 		--build libuv \
 		--settings build_type=Release \
+		--settings compiler.cppstd=17 \
 		--options reporting=True
 
 	cmake -DCMAKE_TOOLCHAIN_FILE:FILEPATH=build/generators/conan_toolchain.cmake \
@@ -58,7 +73,6 @@ override_dh_auto_configure:
 
 override_dh_auto_build:
 	cmake --build bld/rippled --target rippled --target validator-keys -j${nproc}
-
 	cmake --build bld/rippled-reporting --target rippled -j${nproc}
 
 override_dh_auto_install: