GHA Alpine: include shared druntime+Phobos too

Author: kinke

.github/actions/6-integration-test/action.yml

@@ -15,9 +15,6 @@ runs:
       run: |
         set -eux
         cd ..
-        if type -P apk &>/dev/null; then
-          exit 0 # Alpine: no shared libs
-        fi
         if [[ '${{ runner.os }}' == Windows ]]; then
           # add druntime/Phobos DLL dir to PATH
           export PATH="$PWD/installed/bin:$PATH"

.github/workflows/main.yml

@@ -61,7 +61,6 @@ jobs:
             # TSan and XRay do not work.
             extra_cmake_flags: >-
               -DBUILD_LTO_LIBS=ON
-              -DBUILD_SHARED_LIBS=OFF
               -DLLVM_IS_SHARED=OFF
               -DLDC_ENABLE_PLUGINS=OFF
               -DLDC_DYNAMIC_COMPILE=OFF