Copy, don't move.

Some of the files moved are needed afterwards for the build artifacts.

.gitlab-ci.yml

@@ -39,12 +39,12 @@ build:
     # alas the Bash completion doesn't take the prefix into account nor can it
     # be overwritten, so I went for a manual approach.
     - mkdir -p output/usr/local/share/man/man1
-    - mv toolbox/builddir/doc/* output/usr/local/share/man/man1/
+    - cp toolbox/builddir/doc/* output/usr/local/share/man/man1/
     - mkdir -p output/usr/local/bin
-    - mv toolbox/builddir/src/toolbox output/usr/local/bin/
+    - cp toolbox/builddir/src/toolbox output/usr/local/bin/
     - mkdir -p output/usr/share/bash-completion/completions
     # yamllint disable-line rule:line-length
-    - mv toolbox/completion/bash/toolbox output/usr/share/bash-completion/completions/
+    - cp toolbox/completion/bash/toolbox output/usr/share/bash-completion/completions/
     - tar -C output -czf toolbox.tar.gz ./
   artifacts:
     paths: