Add OCI labels

Fixes #2170

Dockerfile

@@ -1,10 +1,20 @@
 FROM node:24-alpine AS builder
 
+# OCI Image Labels - Build Args for dynamic values
+ARG VERSION="dev"
+ARG REVISION=""
+ARG CREATED=""
+ARG LICENSE="AGPL-3.0"
+
 WORKDIR /app
 
 ARG BUILD=oss
 ARG DATABASE=sqlite
 
+# Derive title and description based on BUILD type
+ARG IMAGE_TITLE="Pangolin"
+ARG IMAGE_DESCRIPTION="Identity-aware VPN and proxy for remote access to anything, anywhere"
+
 RUN apk add --no-cache curl tzdata python3 make g++
 
 # COPY package.json package-lock.json ./
@@ -69,4 +79,17 @@ RUN chmod +x /usr/local/bin/pangctl ./dist/cli.mjs
 COPY server/db/names.json ./dist/names.json
 COPY public ./public
 
+# OCI Image Labels
+# https://github.com/opencontainers/image-spec/blob/main/annotations.md
+LABEL org.opencontainers.image.source="https://github.com/fosrl/pangolin" \
+      org.opencontainers.image.url="https://github.com/fosrl/pangolin" \
+      org.opencontainers.image.documentation="https://docs.pangolin.net" \
+      org.opencontainers.image.vendor="Fossorial" \
+      org.opencontainers.image.licenses="${LICENSE}" \
+      org.opencontainers.image.title="${IMAGE_TITLE}" \
+      org.opencontainers.image.description="${IMAGE_DESCRIPTION}" \
+      org.opencontainers.image.version="${VERSION}" \
+      org.opencontainers.image.revision="${REVISION}" \
+      org.opencontainers.image.created="${CREATED}"
+
 CMD ["npm", "run", "start"]