devcontainer: include packit, boto3 & more tools

Include the packit tool to be able to do updates from the container.
Additionally, include python-boto3 so that `make test-src` now does
not complain about missing `boto3` imports.
Also include ipython3 for quick python code snippet testing and
lsof to debug processes that keep files open.

NB: for packit to work you have to have the right tokens in your
local packit configration file (see the upstream doc). Additionally,
`packit propose-downstream`, to create PRs for a new downstream
release, needs kerberos auth to work correctly.

.devcontainer/Dockerfile

@@ -7,10 +7,13 @@ RUN dnf install -y \
     git \
     glibc-langpack-en \
     hostname \
+    ipython3 \
     jq \
     libguestfs-tools libguestfs \
     libosinfo \
+    lsof \
     make \
+    packit \
     qemu-img \
     qemu-system-x86 \
     osbuild \
@@ -18,6 +21,7 @@ RUN dnf install -y \
     podman \
     pylint \
     python3-autopep8 \
+    python3-boto3 \
     python3-devel \
     python3-docutils \
     python3-enchant \