docker: switch base image to cgr.dev/chainguard/jdk:latest

Signed-off-by: Koichi Shiraishi <zchee.io@gmail.com>

Dockerfile

@@ -1,25 +1,20 @@
 # syntax=docker/dockerfile-upstream:master-labs
 
-FROM debian:bullseye-slim AS cloud-firestore-emulator
+FROM --platform=$BUILDPLATFORM cgr.dev/chainguard/jdk:latest AS cloud-pubsub-emulator
 ARG TARGETPLATFORM
 
 ARG FIRESTORE_EMULATOR_BUILD_NUMBER
-LABEL org.opencontainers.image.authors       "The containerz authors"
-LABEL org.opencontainers.image.url           "https://github.com/containerz-dev/cloud-firestore-emulator"
-LABEL org.opencontainers.image.source        "https://github.com/containerz-dev/cloud-firestore-emulator"
-LABEL org.opencontainers.image.documentation "Cloud SDK less cloud firestore emulator container image"
-LABEL org.opencontainers.image.base.name     "debian:bullseye-slim"
-LABEL org.opencontainers.image.version       "${FIRESTORE_EMULATOR_BUILD_NUMBER}"
-LABEL org.opencontainers.image.licenses      "BSD-3-Clause"
+LABEL org.opencontainers.image.authors="The containerz authors"
+LABEL org.opencontainers.image.url="https://github.com/containerz-dev/cloud-firestore-emulator"
+LABEL org.opencontainers.image.source="https://github.com/containerz-dev/cloud-firestore-emulator"
+LABEL org.opencontainers.image.documentation="Cloud SDK less cloud firestore emulator container image"
+LABEL org.opencontainers.image.base.name="cgr.dev/chainguard/jdk:latest"
+LABEL org.opencontainers.image.version="${FIRESTORE_EMULATOR_BUILD_NUMBER}"
+LABEL org.opencontainers.image.licenses="BSD-3-Clause"
 
 ENV FIRESTORE_EMULATOR_URL="https://dl.google.com/dl/cloudsdk/channels/rapid/components/google-cloud-sdk-cloud-firestore-emulator-${FIRESTORE_EMULATOR_BUILD_NUMBER}.tar.gz"
-RUN apt-get update && \
-  apt-get -y install \
-    curl \
-    bash \
-    openjdk-11-jre-headless && \
-	\
-	curl -sSL ${FIRESTORE_EMULATOR_URL} | tar xfz - --strip-components=1 -C /
+ADD --chown=java:java ${FIRESTORE_EMULATOR_URL} /home/build
+RUN tar xfz /home/build/google-cloud-sdk-cloud-firestore-emulator-${FIRESTORE_EMULATOR_BUILD_NUMBER}.tar.gz --strip-components=1 -C /home/build
 
 EXPOSE 8080/tcp
-ENTRYPOINT ["/cloud-firestore-emulator/cloud_firestore_emulator", "--host", "0.0.0.0"]
+ENTRYPOINT ["/home/build/cloud-firestore-emulator/cloud_firestore_emulator", "--host=0.0.0.0", "--port=8080"]