speedrun to clone MAL lists [4/n]

fix: downgrade corretto from 22 to 21;
setup maven in another layer with pre-build binaries
instead of fetch with alpine package manager.

todo: whole app
todo: fix the sed syntax for appending maven into the pom.xml in the
setup shellscript.

Dockerfile

@@ -1,7 +1,9 @@
 FROM alpine:3.18
 
 #ARG version=8.382.05.1
-ARG version=22.0.0.37
+#ARG version=22.0.0.37.1; builds, no maven
+ARG version=21.0.2.14.1
+# works with maven
 
 #slim build with jlink to keep jre size at a minimum
 RUN wget -O /THIRD-PARTY-LICENSES-20200824.tar.gz https://corretto.aws/downloads/resources/licenses/alpine/THIRD-PARTY-LICENSES-20200824.tar.gz && \
@@ -12,17 +14,31 @@ RUN wget -O /THIRD-PARTY-LICENSES-20200824.tar.gz https://corretto.aws/downloads
     SHA_SUM="6cfdf08be09f32ca298e2d5bd4a359ee2b275765c09b56d514624bf831eafb91" && \
     echo "${SHA_SUM}  /etc/apk/keys/amazoncorretto.rsa.pub" | sha256sum -c - && \
     echo "https://apk.corretto.aws" >> /etc/apk/repositories && \
-    apk add --no-cache amazon-corretto-22=$version-r0 binutils maven && \
+    apk add --no-cache amazon-corretto-21=$version-r0 binutils && \
     /usr/lib/jvm/default-jvm/bin/jlink --add-modules "$(java --list-modules | sed -e 's/@[0-9].*$/,/' | tr -d \\n)" --no-man-pages --no-header-files --strip-debug --output /opt/corretto-slim && \
-    apk del binutils amazon-corretto-20 && \
+    apk del binutils amazon-corretto-21 && \
     mkdir -p /usr/lib/jvm/ && \
-    mv /opt/corretto-slim /usr/lib/jvm/java-22-amazon-corretto && \
-    ln -sfn /usr/lib/jvm/java-22-amazon-corretto /usr/lib/jvm/default-jvm
+    mv /opt/corretto-slim /usr/lib/jvm/java-21-amazon-corretto && \
+    ln -sfn /usr/lib/jvm/java-21-amazon-corretto /usr/lib/jvm/default-jvm
+
 
 ENV LANG C.UTF-8
 ENV JAVA_HOME=/usr/lib/jvm/default-jvm
+#ENV JAVA_HOME="$(/usr/libexec/java_home -v 21)"
 ENV PATH=$PATH:/usr/lib/jvm/default-jvm/bin
 
+# ====== maven setup, new layer ======
+ENV MAVEN_VERSION 3.9.2
+ENV MAVEN_HOME /usr/lib/mvn
+ENV PATH $MAVEN_HOME/bin:$PATH
+
+RUN wget http://archive.apache.org/dist/maven/maven-3/$MAVEN_VERSION/binaries/apache-maven-$MAVEN_VERSION-bin.tar.gz && \
+  tar -zxvf apache-maven-$MAVEN_VERSION-bin.tar.gz && \
+  rm apache-maven-$MAVEN_VERSION-bin.tar.gz && \
+  mv apache-maven-$MAVEN_VERSION /usr/lib/mvn
+
+# ====================
+
 ARG APPLICATION_USER=appuser
 RUN adduser --no-create-home -u 1000 -D $APPLICATION_USER && \
     mkdir /app && \

README.md

@@ -2,6 +2,12 @@
 
 A speedrun attempt to clone [MAL](https://myanimelist.net/) lists into a github pages subdomain, using SpringBoot. IaC automation provided by OCI containers, compose, github actions and scaffolding with shellscript.
 
+The second attempt is to make the app ~**blazingly**~ fast by having a slim container image build, featuring:
+- alpine as OCI container distro;
+- [amazon-corretto-22]() as JRE;
+- symbol stripping with [jlink]();
+- to avoid layer bloat, ~only one~ two are being used to download and remove build dependencies. Dockerfile inspired by the official [corretto](https://github.com/corretto/corretto-docker/) repo
+
 ## Usage
 
 1. clone repository with SSH and enter directory