chore(public/sendme.sh): Make POSIX compliant, wrap vars, and add verbosity to tar

Author: yermulnik

public/sendme.sh

@@ -27,16 +27,16 @@ release_target_url=$(
     sed -re 's/.*: "([^"]+)".*/\1/' \
 )
 
-if [[ "$release_target_url" =~ \.zip$ ]]; then
+if [ "${release_target_url##.*}" = "zip" ]; then
     release_archive=$(
         curl -s "$release_url" |
         grep "name" |
         grep "$target" |
         sed -re 's/.*: "([^"]+)".*/\1/' \
     )
-    curl -sL "$release_target_url" -o $release_archive
-    unzip -oq $release_archive
-    rm -rf $release_archive
+    curl -sL "$release_target_url" -o "$release_archive"
+    unzip -oq "$release_archive"
+    rm -rf "$release_archive"
 else
-    curl -sL "$release_target_url" | tar xz
+    curl -sL "$release_target_url" | tar vxz
 fi