Support checks

.ci/images/build/Dockerfile

@@ -9,7 +9,11 @@ RUN apt-get update && \
     apt-get update && \
     apt-get install -y --no-install-recommends gcc-8 g++-8 binutils-2.26 && \
     update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-8 60 --slave /usr/bin/g++ g++ /usr/bin/g++-8 && \
+    add-apt-repository ppa:deadsnakes/ppa -y && \
+    apt-get update && \
+    apt-get install -y --no-install-recommends libpython3-dev && \
     rm -rf /var/lib/apt/lists/*
+
 ENV PATH="/usr/lib/binutils-2.26/bin:${PATH}"
 
 # Install Protocol Buffers compiler by hand, since Ubuntu 14.04 does not have a recent enough version.

.gitignore

@@ -2,5 +2,7 @@ target/
 .vscode/
 tooling/bin/
 test/k8s/charts/
+test/build
+dist/checks.d/__pycache__
 test/build/
-lib/ddsketch-agent/dhat-heap.json
+lib/ddsketch-agent/dhat-heap.json