ci: extract splitsh tarball to fresh subdir to avoid /tmp perms error

Author: gabepri

.github/workflows/split-php.yml

@@ -33,8 +33,9 @@ jobs:
 
       - name: Install splitsh-lite
         run: |
-          curl -sL https://github.com/splitsh/lite/releases/download/v1.0.1/lite_linux_amd64.tar.gz | tar -xz -C /tmp
-          sudo mv /tmp/splitsh-lite /usr/local/bin/
+          mkdir -p /tmp/splitsh
+          curl -sL https://github.com/splitsh/lite/releases/download/v1.0.1/lite_linux_amd64.tar.gz | tar -xz -C /tmp/splitsh
+          sudo mv /tmp/splitsh/splitsh-lite /usr/local/bin/
 
       - name: Determine ref to mirror
         id: ref