Update Dockerfile

Dockerfile

@@ -7,10 +7,9 @@ ENV NB_UID 1000
 ENV HOME /home/${NB_USER}
 ENV JAVA_HOME /usr/lib/jvm/java-17-openjdk-amd64/
 ENV DEBIAN_FRONTEND=noninteractive
-ENV TZ=Etc/UTC
 
 # Install required packages
-RUN apt-get update && apt-get install -y --no-install-recommends \
+RUN apt-get update && apt-get install -y \
     tar \
     wget \
     bash \
@@ -30,13 +29,17 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     openjdk-17-jdk \
     ant \
     ca-certificates-java \
+    gnupg \
     && apt-get clean \
     && update-ca-certificates -f
 
+# Add the deadsnakes PPA and import GPG key manually
+RUN wget -qO - https://keyserver.ubuntu.com/pks/lookup?op=get&search=0xBA6932366A755776 | gpg --dearmor -o /usr/share/keyrings/deadsnakes.gpg \
+    && echo "deb [signed-by=/usr/share/keyrings/deadsnakes.gpg] http://ppa.launchpad.net/deadsnakes/ppa/ubuntu jammy main" > /etc/apt/sources.list.d/deadsnakes.list \
+    && apt-get update
+
 # Install Python 3.11 (latest stable version)
-RUN add-apt-repository ppa:deadsnakes/ppa \
-    && apt-get update \
-    && apt-get install -y --no-install-recommends python3.11 python3.11-venv python3.11-dev python3-pip \
+RUN apt-get install -y python3.11 python3.11-venv python3.11-dev python3-pip \
     && apt-get clean
 
 # Set up JAVA_HOME