Fix SourceHut package CI dependencies

ober

261ada35cdb8aa416ea3c7a975342196ecbe2292

diff --git a/.build.yml b/.build.yml
index dac4a52..afe0d32 100644
--- a/.build.yml
+++ b/.build.yml
@@ -10,6 +10,7 @@ packages:
   - libpcre2-dev
   - libvterm-dev
   - libx11-dev
+  - file
   - git
   - curl
   - unzip