build: Add detection script for a better package maintenance experience

scripts/detect-libphosh-api-version.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+pc_file=$(find "/usr/lib64/pkgconfig" -maxdepth 1 -type f -name "libphosh-*.pc" | head -n 1)
+
+if [ -z "$pc_file" ]; then
+  echo "File libphosh-*.pc not found."
+  exit 1
+fi
+
+version=$(basename "$pc_file" | sed -E 's/^libphosh-([0-9.]+)\.pc$/\1/')
+
+if [ -z "$version" ]; then
+  echo "Can't detect version of $pc_file."
+  exit 1
+fi
+
+echo $version
+exit 0