chore: refactor Dockerfile for improved security

- Remove `.hadolint.yaml` from the project
- Add open container labels to the Dockerfile

Signed-off-by: Bo-Yi.Wu <[email protected]>

Author: appleboy

.hadolint.yaml

@@ -8,7 +8,11 @@ LABEL maintainer="Bo-Yi Wu <[email protected]>" \
   org.label-schema.vendor="Bo-Yi Wu" \
   org.label-schema.schema-version="1.0"
 
-RUN apk add --no-cache ca-certificates && \
+LABEL org.opencontainers.image.source=https://github.com/appleboy/drone-scp
+LABEL org.opencontainers.image.description="Copy files and artifacts via SSH"
+LABEL org.opencontainers.image.licenses=MIT
+
+RUN apk add --no-cache ca-certificates=20220614-r4 && \
   rm -rf /var/cache/apk/*
 
 COPY release/${TARGETOS}/${TARGETARCH}/drone-scp /bin/