Workaround mv on Windows which can remove jruby.exe

Author: eregon

.github/workflows/build.yml

@@ -160,28 +160,23 @@ jobs:
     - run: echo "JAVA_HOME=${JAVA_HOME_21_X64:-${JAVA_HOME_21_arm64:-}}" >> "$GITHUB_ENV"
       shell: bash
 
-    - name: Set PREFIX
-      run: echo "PREFIX=$HOME/.rubies/${{ steps.ruby.outputs.ruby }}" >> $GITHUB_ENV
-      shell: bash
     - run: curl --fail -L -O 'https://repo1.maven.org/maven2/org/jruby/jruby-dist/${{ matrix.jruby-version }}/jruby-dist-${{ matrix.jruby-version }}-bin.tar.gz'
       shell: bash
     # NOTE: Keep the logic from here in sync with jruby-dev-builder's build job
     # Extracting must be done in the native shell: https://github.com/MSP-Greg/ruby-setup-ruby/issues/1
     # We need to use to use the system tar, the Git tar seems basically broken
+    # And `mv dir /c/...` also removes jruby.exe, so we need to avoid that.
     - run: C:\windows\system32\tar.exe xf jruby-dist-${{ matrix.jruby-version }}-bin.tar.gz
-    - name: Move to prefix
+    - name: Check bin/
       shell: bash
-      run: |
-        mkdir $(dirname $PREFIX)
-        ls -l jruby-${{ matrix.jruby-version }}/bin
-        mv jruby-${{ matrix.jruby-version }} $(dirname $PREFIX)
-        ls -l $PREFIX/bin
+      run: ls -l jruby-${{ matrix.jruby-version }}/bin
     - name: Create archive
-      run: tar czf ${{ steps.ruby.outputs.archive }} -C $(dirname $PREFIX) $(basename $PREFIX)
-      shell: bash
+      run: tar czf ${{ steps.ruby.outputs.archive }} jruby-${{ matrix.jruby-version }}
+    # End of shared logic with jruby-dev-builder
     - name: Install Bundler if needed
       shell: bash
       run: |
+        export "PREFIX=$PWD/jruby-${{ matrix.jruby-version }}"
         if [ ! -e $PREFIX/bin/bundle ]; then
           export PATH="$PREFIX/bin:$PATH"
           gem install bundler -v '~> 1' --no-document