Pin Docker image eclipse-temurin:17-jre-focal

eclipse-temurin:17-jre-focal
->
eclipse-temurin:17-jre-focal@sha256:55c1ff40a91898c456dc5a874a66db17b6aa1b4aef8d9cac1ad3b194575638a1

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 [atomist-skill:atomist/docker-base-image-policy]

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react-java-mysql/backend/Dockerfile

@@ -29,7 +29,7 @@ RUN mkdir -p target/dependency
 WORKDIR /workdir/server/target/dependency
 RUN jar -xf ../*.jar
 
-FROM eclipse-temurin:17-jre-focal
+FROM eclipse-temurin:17-jre-focal@sha256:55c1ff40a91898c456dc5a874a66db17b6aa1b4aef8d9cac1ad3b194575638a1
 
 EXPOSE 8080
 VOLUME /tmp