feat: add opencontainers labels (#157)

Author: williamboman

.github/workflows/docker-image-push.yml

@@ -59,7 +59,7 @@ jobs:
         env:
           PLATFORMS: linux/amd64,linux/arm64/v8,linux/arm/v7
         run: |
-          set -euo pipefail
+          set -euxo pipefail
 
           VERSION="$(git describe --exact-match --tags HEAD)"
           TAG="$VERSION"
@@ -82,6 +82,7 @@ jobs:
           fi
 
           docker buildx build \
+              --label org.opencontainers.artifact.created="$(date --rfc-3339=seconds --utc)" \
               --push \
               --platform "${PLATFORMS}" \
               "${TAGS[@]}" \

Dockerfile

@@ -1,5 +1,15 @@
 FROM node:lts-alpine
 
+ARG THELOUNGE_VERSION=4.4.0-pre.2
+
+LABEL org.opencontainers.image.title "Official The Lounge image"
+LABEL org.opencontainers.image.description "Official Docker image for The Lounge, a modern web IRC client designed for self-hosting."
+LABEL org.opencontainers.image.authors "The Lounge #thelounge @irc.libera.chat"
+LABEL org.opencontainers.image.url "https://github.com/thelounge/thelounge-docker"
+LABEL org.opencontainers.image.source "https://github.com/thelounge/thelounge-docker"
+LABEL org.opencontainers.image.version "${THELOUNGE_VERSION}"
+LABEL org.opencontainers.image.licenses "MIT"
+
 ENV NODE_ENV production
 
 ENV THELOUNGE_HOME "/var/opt/thelounge"
@@ -15,7 +25,6 @@ CMD ["thelounge", "start"]
 COPY docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
 
 # Install thelounge.
-ARG THELOUNGE_VERSION=4.4.0-pre.2
 RUN apk --update --no-cache --virtual build-deps add python3 build-base git && \
     ln -sf python3 /usr/bin/python && \
     yarn --non-interactive --frozen-lockfile global add thelounge@${THELOUNGE_VERSION} && \

README.md

@@ -1,6 +1,6 @@
 ![The Lounge](https://raw.githubusercontent.com/thelounge/thelounge.github.io/master/assets/logos/logo/TL_Grey%26Yellow_Vertical_logotype_Transparent_Bg/TL_Grey%26Yellow_Vertical_logotype_Transparent_Bg.png)
 
-#### Docker container for The Lounge, modern web IRC client designed for self-hosting
+#### Docker image for The Lounge, a modern web IRC client designed for self-hosting
 
 **[Website](https://thelounge.chat/) • [Docs](https://thelounge.chat/docs) • [Demo](https://demo.thelounge.chat/)**