Make ubuntu22 base image docker cache friendly

Use wget instead of ADD to allow efficient caching of tini install.

docker/Dockerfile.base.ubuntu22

@@ -53,15 +53,15 @@ RUN apt-get update && \
        flex \
        m4 \
        # python3-pip for conf template generation
-       python3-pip && \
+       python3-pip \
+       wget && \
     update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-12 100 --slave /usr/bin/g++ g++ /usr/bin/g++-12 && \
     pip3 install --ignore-installed pyyaml
 
 # Add "Tini - A tiny but valid init for containers", https://github.com/krallin/tini
 # it will be copied into target containers, to print exit numbers and handle signals properly
 ENV TINI_VERSION=v0.19.0
-ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini-${TARGETARCH} /tini
-RUN chmod +x /tini
+RUN wget https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini-${TARGETARCH} -O /tini && chmod +x /tini
 
 # In some network environments, GIT proxy is required
 RUN /bin/bash -c "if [[ -v NEEDED_GIT_PROXY ]]; then git config --global http.proxy $NEEDED_GIT_PROXY; fi"