Update Testkit tests Docker setup

One notable benefit is that this works on Apple M1.

Author: injectives

testkit-tests/pom.xml

@@ -30,7 +30,7 @@
         <!-- Debug logging for backend messages. Empty string - off, Non-empty string - on. -->
         <testkit.debug.reqres></testkit.debug.reqres>
 
-        <docker-maven-plugin.version>0.36.1</docker-maven-plugin.version>
+        <docker-maven-plugin.version>0.40.2</docker-maven-plugin.version>
         <docker.showLogs>true</docker.showLogs>
     </properties>
 

testkit-tests/src/main/docker/Dockerfile

@@ -1,15 +1,15 @@
 FROM python:3.10.0b4-buster
 
 RUN apt-get update && apt-get install -y \
-      apt-transport-https \
       ca-certificates \
       curl \
       gnupg \
       lsb-release
 
-RUN curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
+RUN mkdir -p /etc/apt/keyrings \
+      && curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg
 
-RUN echo "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian $(lsb_release -cs) stable" \
+RUN echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian $(lsb_release -cs) stable" \
       | tee /etc/apt/sources.list.d/docker.list > /dev/null
 
 RUN apt-get update && apt-get install -y \