Update build.yml

Author: oriddd

.github/workflows/build.yml

@@ -58,8 +58,7 @@ jobs:
         overwrite: true
     - name: Create jar's hash file 
       run: |
-        jar_file= $(<build/libs/${{ env.TP_SDK_JAR_NAME }}-${{ env.TP_SDK_VERSION }}-${{ env.TP_SDK_VARIANT}}-${{ env.TP_SDK_FULL_JAR_EXT }})
-        md5sum "$jar_file" > build/libs/jar-hash.md
+        md5sum build/libs/${{ env.TP_SDK_JAR_NAME }}-${{ env.TP_SDK_VERSION }}-${{ env.TP_SDK_VARIANT}}-${{ env.TP_SDK_FULL_JAR_EXT }} > build/libs/jar-hash.md
     - name: Upload hash artifact
       uses: actions/upload-artifact@v2
       with: