docker: added OCI-compatible image labels

See https://github.com/opencontainers/image-spec/blob/master/annotations.md

client/Dockerfile

@@ -29,3 +29,16 @@ COPY --from=approot / /
 
 CMD ["/docker-start.sh"]
 VOLUME ["/data"]
+
+ARG DOCKER_REPO
+ARG BUILD_DATE
+ARG SOURCE_COMMIT
+LABEL \
+    maintainer="" \
+    org.opencontainers.image.title="${DOCKER_REPO}" \
+    org.opencontainers.image.url="https://github.com/rr-/szurubooru" \
+    org.opencontainers.image.documentation="https://github.com/rr-/szurubooru/blob/${SOURCE_COMMIT}/doc/INSTALL.md" \
+    org.opencontainers.image.created="${BUILD_DATE}" \
+    org.opencontainers.image.source="https://github.com/rr-/szurubooru" \
+    org.opencontainers.image.revision="${SOURCE_COMMIT}" \
+    org.opencontainers.image.licenses="GPL-3.0"

client/hooks/build

@@ -1,11 +1,16 @@
 #!/bin/sh
 
-CLOSEST_VER=$(git describe --tags --abbrev=0)
-if git describe --exact-match --abbrev=0 2> /dev/null; then
+CLOSEST_VER=$(git describe --tags --abbrev=0 ${SOURCE_COMMIT})
+if git describe --exact-match --abbrev=0 ${SOURCE_COMMIT} 2> /dev/null; then
 	BUILD_INFO="v${CLOSEST_VER}"
 else
-	BUILD_INFO="v${CLOSEST_VER}-edge-$(echo $SOURCE_COMMIT | cut -c1-7)"
+	BUILD_INFO="v${CLOSEST_VER}-edge-$(git rev-parse --short ${SOURCE_COMMIT})"
 fi
 
-echo "Using BUILD_INFO=$BUILD_INFO"
-docker build --build-arg BUILD_INFO=$BUILD_INFO -f $DOCKERFILE_PATH -t $IMAGE_NAME .
+echo "Using BUILD_INFO=${BUILD_INFO}"
+docker build \
+	--build-arg BUILD_INFO \
+	--build-arg BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ') \
+	--build-arg SOURCE_COMMIT \
+	--build-arg DOCKER_REPO \
+	-f $DOCKERFILE_PATH -t $IMAGE_NAME .

server/Dockerfile

@@ -42,3 +42,16 @@ ENV PORT=${PORT}
 EXPOSE ${PORT}
 VOLUME ["/data/"]
 CMD ["/opt/app/docker-start.sh"]
+
+ARG DOCKER_REPO
+ARG BUILD_DATE
+ARG SOURCE_COMMIT
+LABEL \
+    maintainer="" \
+    org.opencontainers.image.title="${DOCKER_REPO}" \
+    org.opencontainers.image.url="https://github.com/rr-/szurubooru" \
+    org.opencontainers.image.documentation="https://github.com/rr-/szurubooru/blob/${SOURCE_COMMIT}/doc/INSTALL.md" \
+    org.opencontainers.image.created="${BUILD_DATE}" \
+    org.opencontainers.image.source="https://github.com/rr-/szurubooru" \
+    org.opencontainers.image.revision="${SOURCE_COMMIT}" \
+    org.opencontainers.image.licenses="GPL-3.0"

server/hooks/build

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+docker build \
+	--build-arg BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ') \
+	--build-arg SOURCE_COMMIT \
+	--build-arg DOCKER_REPO \
+	-f $DOCKERFILE_PATH -t $IMAGE_NAME .