Update Dockerfile

Signed-off-by: Zoey <zoey@z0ey.de>

Dockerfile

@@ -6,7 +6,7 @@ ARG MAVEN4_VERSION=4.0.0-alpha-13
 RUN wget https://apk.corretto.aws/amazoncorretto.rsa.pub -O /etc/apk/keys/amazoncorretto.rsa.pub && \
     echo "https://apk.corretto.aws" | tee -a /etc/apk/repositories && \
     apk upgrade --no-cache -a && \
-    apk add --no-cache ca-certificates tzdata tini shadow \
+    apk add --no-cache ca-certificates tzdata tini shadow openssl \
                        git git-lfs \
                        netcat-openbsd \
                        openssh-server \
@@ -23,7 +23,8 @@ RUN wget https://apk.corretto.aws/amazoncorretto.rsa.pub -O /etc/apk/keys/amazon
     wget https://dlcdn.apache.org/maven/maven-4/"$MAVEN4_VERSION"/binaries/apache-maven-"$MAVEN4_VERSION"-bin.tar.gz -O - | tar xz -C /usr/local/bin && \
     mv /usr/local/bin/apache-maven-"$MAVEN4_VERSION" /usr/local/bin/mvn4 && \
     useradd -d /tmp -Ms /bin/ash -u 1000 jenkins && \
-    apk del --no-cache shadow
+    echo "jenkins:$(openssl rand -base64 12)" | chpasswd && \
+    apk del --no-cache shadow openssl
 
 COPY --from=docker:26.0.0-cli-alpine3.19 /usr/local/bin/docker /usr/local/bin/docker
 COPY setup-sshd.sh /usr/local/bin/setup-sshd.sh