fix some docker lints

Author: lmaotrigine

.github/workflows/release.yml

@@ -2,6 +2,7 @@ on:
   push:
     tags:
       - '*'
+  workflow_dispatch:
 
 defaults:
   run:

Dockerfile

@@ -44,11 +44,11 @@ FROM scratch
 
 # Labels
 # Reference: https://github.com/opencontainers/image-spec/blob/main/annotations.md
-LABEL org.opencontainers.image.source "https://github.com/lmaotrigine/heartbeat"
-LABEL org.opencontainers.image.authors "[email protected]"
-LABEL org.opencontainers.image.title "heartbeat"
-LABEL org.opencontainers.image.description "A service to show a live digital heartbeat (ping) on multiple devices."
-LABEL org.opencontainers.image.licenses "MPL-2.0"
+LABEL org.opencontainers.image.source="https://github.com/lmaotrigine/heartbeat"
+LABEL org.opencontainers.image.authors="[email protected]"
+LABEL org.opencontainers.image.title="heartbeat"
+LABEL org.opencontainers.image.description="A service to show a live digital heartbeat (ping) on multiple devices."
+LABEL org.opencontainers.image.licenses="MPL-2.0"
 
 COPY --from=build /usr/src/app/target/release/heartbeat /.heartbeat/bin/heartbeat
 ENV HEARTBEAT_HOME=/.heartbeat