CI: Build for Gentoo (normal and musl)

Author: luke-jr

.github/workflows/build.yaml

@@ -22,6 +22,8 @@ jobs:
           - alpine:latest
           - archlinux:latest
           - clearlinux:latest
+          - gentoo/stage3:musl-hardened
+          - gentoo/stage3:hardened
         config:
           - cmake_args: "-DENABLE_API=ON -DCMAKE_C_COMPILER=gcc"
           - cmake_args: "-DENABLE_API=ON -DCMAKE_C_COMPILER=clang"
@@ -69,6 +71,12 @@ jobs:
               PACKAGES_CLANG="llvm"
               PACKAGES_GCC=''  # included in c-basic
               ;;
+            gentoo/*)
+              INSTALL_CMD="emerge --sync --quiet && emerge -vuDtkg --noreplace --jobs=\$(nproc)"
+              PACKAGES="dev-vcs/git dev-build/cmake net-misc/curl dev-libs/jansson dev-libs/libsodium virtual/pkgconfig"
+              PACKAGES_API="net-libs/libmicrohttpd"
+              PACKAGES_CLANG="llvm-core/clang"
+              ;;
           esac
           PACKAGES="$PACKAGES ${{ matrix.config.extra_deps }}"
           if [[ "${{ matrix.config.cmake_args }}" =~ ENABLE_API=ON ]]; then