if a build-fail hook fails, kiss thinks the package built successfully

Does this issue occur in master?

Description

Create a dummy package which will fail to build

kiss-new badpkg 0
echo "false" >> badpkg/build

Create a build-fail hook which will fail

cat << EOF > hook.sh
#!/bin/sh -e
case "\$1" in build-fail) false ;; esac
EOF

Try building the unbuildable package:

$ cd badpkg && KISS_HOOK=../hook.sh kiss b
-> Building: explicit: testpkg 
-> Checking for pre-built dependencies 
-> testpkg Reading sources
-> testpkg Verifying sources
-> testpkg Building package (1/1)
-> testpkg Extracting sources
-> testpkg Starting build
-> testpkg Build failed
-> testpkg Log stored to /home/ben/.cache/kiss/logs/2021-08-16/testpkg-2021-08-16-20:46-1497987
ERROR build-fail hook failed: '/tmp/test.sh' 
-> testpkg Successfully built package
-> testpkg Generating manifest
-> testpkg Stripping binaries and libraries
-> testpkg looking for dependencies (using readelf)
-> testpkg Generating etcsums
-> testpkg Creating tarball
-> testpkg Successfully created tarball
-> Install built packages? [testpkg] 
-> Continue?: Press Enter to continue or Ctrl+C to abort 
Using /usr/bin/ssu (to become root)
-> testpkg Checking if manifest valid
-> testpkg Checking if package installable
-> testpkg Checking for package conflicts
-> testpkg Installing package (testpkg@0-1.tar.gz)
-> testpkg Installed successfully

This occurs because when a hook fails, die is called, which exits. I think exit causes the shell to exit from the subshell environment it was invoked in.
The relevant section in pkg_build is:

kiss/kiss

Line 1010 in cb98a88

run_hook build-fail "$pkg" "$mak_dir/$1"

{
...
"$repo_dir/build" "$pkg_dir/$1" "$repo_ver" 2>&1 || {
            log "$1" "Build failed"
            log "$1" "Log stored to $log_dir/$1-$time-$KISS_PID"

            # arg1: build-fail
            # arg2: package name
            # arg3: path to build directory
            run_hook build-fail "$pkg" "$mak_dir/$1"

            pkg_clean
            kill 0
        }
    } | tee "$log_dir/$1-$time-$KISS_PID"
# continue building package

We exit the subshell, so kill 0 is never called and the build continues.

Thanks!