fix healthcheck command

Author: enchant97

app/Dockerfile

@@ -44,5 +44,5 @@ FROM gcr.io/distroless/static-debian12
     VOLUME /opt/hasty-paste/data
 
     CMD [ "./hasty-paste" ]
-    HEALTHCHECK --interval=2m --timeout=5s --start-period=20s --start-interval=5s --retries=3
+    HEALTHCHECK --interval=2m --timeout=5s --start-period=20s --start-interval=5s --retries=3 \
         CMD [ "./hasty-paste", "health-check" ]