Update post-receive git hook

On the new server, `zola` is installed through snap, which means it's
now sandboxed, and doesn't have direct access to the whole filesystem.
This update mostly changes a few bits so that `zola` works only on its
home, and calls `mv` at the end to change the served directory. This
also reduces the time during which the website is destroyed before being
replaced.

.githooks/post-receive

@@ -3,19 +3,22 @@
 set -e
 
 OUTPUT_DIR="/storage/www/hya.sk/website/"
-
-# Gitea calls us from the repository root
 BASE="$(pwd)"
-
-# Ensure this doesn't exist
 unset GIT_DIR
 
-TMP_DIR="$(mktemp -d)"
-git clone "file://$BASE" --depth 1 "$TMP_DIR"
+# Work in a temp dir
+TMP_DIR="$(mktemp -d -p "$HOME")"
 pushd "$TMP_DIR"
 
+# Build and publish website
+git clone "file://$BASE" --depth 1 .
+zola build
 rm "$OUTPUT_DIR"/* -rf
-zola build -o "$OUTPUT_DIR"/zola
+mv public "$OUTPUT_DIR"/zola
 
+# Clean up temp dir
 popd
 rm -rf "$TMP_DIR"
+
+# Finished
+exit 0