update docker entrypoint

Author: HarryGogonis

Dockerfile

@@ -4,5 +4,5 @@ RUN apk add --no-cache \
 	sed \
 	diffoscope
 
-COPY entrypoint.sh .
-ENTRYPOINT [ "./entrypoint.sh" ]
+COPY entrypoint.sh /usr/local/bin/entrypoint.sh
+ENTRYPOINT [ "/usr/local/bin/entrypoint.sh" ]