Allow building PlatformIO manifest from IDF commits

Author: me-no-dev

build.sh

@@ -319,7 +319,7 @@ export IDF_COMMIT=$(git -C "$IDF_PATH" rev-parse --short HEAD)
 # Generate PlatformIO library manifest file
 if [ "$BUILD_TYPE" = "all" ]; then
     pushd $IDF_PATH
-    ibr=$(git describe --all --exact-match 2>/dev/null)
+    ibr=$(git describe --all 2>/dev/null)
     ic=$(git -C "$IDF_PATH" rev-parse --short HEAD)
     popd
     python3 ./tools/gen_pio_lib_manifest.py -o "$TOOLS_JSON_OUT/" -s "$ibr" -c "$ic"