feat: Add OCI standard labels to Dockerfile (#3412)

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## Checks
- [x] I am happy for maintainers to push small adjustments to this PR,
to speed up the review cycle
- [x] I have checked that there are no existing pull requests for the
same thing

Hi there! Just a small thing I noticed; I self-host an Atuin server via
Docker and have started bumping my compose dependencies with Renovate.
They have a feature that pulls the changelog and displays it in-line in
the PR, which is handy when it works! - but currently this doesn't work
for Atuin. According to [their
documentation](https://docs.renovatebot.com/modules/datasource/docker/#description),
the `org.opencontainers.image.source` label needs to point to the
repository for them to grab release notes. Renovate cites their
Dockerfile as an example, so I took a look at [the actual
Dockerfile](https://github.com/renovatebot/renovate/blob/main/tools/docker/Dockerfile)
to see if they had any other labels, and figured I'd pop those in as
well.

No particularly strong feelings on the labeling itself, styling, etc; so
free free to make any changes deemed necessary :)

1 files changed, 3 insertions, 0 deletions

diff --git a/Dockerfile b/Dockerfile
index 4364a3f2..6422ec5b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,6 +17,9 @@ COPY . .
 RUN cargo build --release --bin atuin-server
 
 FROM debian:bookworm-20260202-slim AS runtime
+LABEL org.opencontainers.image.source="https://github.com/atuinsh/atuin" \
+  org.opencontainers.image.url="https://atuin.sh" \
+  org.opencontainers.image.licenses="MIT"
 
 RUN useradd -c 'atuin user' atuin && mkdir /config && chown atuin:atuin /config
 # Install ca-certificates for webhooks to work