ci: install full python3 (not python3-minimal); image :2026-05-14

Build #48 cleared a huge swath of the host toolchain (host-cmake bootstrap,
host-cmake full build, host-ccache, host-gcc-final all completed cleanly on
pod-local emptyDir with the previous HOME/BR2_CCACHE_DIR fixes) and ran for
25 minutes before dying in glibc-2.41-70 target build:

  File "/usr/lib/python3.12/tempfile.py", line 1069, in _rmtree
      _rmtree(name, onexc=onexc)
  TypeError: _rmtree() got an unexpected keyword argument 'onexc'

That traceback is from TemporaryDirectory.__exit__ cleanup, surfacing
during glibc's gen-as-const.py run. tempfile.py was updated for the new
shutil.rmtree onexc= kwarg in Python 3.12, but the shutil in our image
doesn't carry it -- classic python3-minimal symptom (stripped-down
stdlib whose pieces don't always move in lockstep). Install the regular
python3 package instead; that pulls a complete, internally-consistent
stdlib.

Bump tag to :2026-05-14 so the new image rolls out next /build.

Author: espeer

Jenkinsfile

@@ -60,7 +60,7 @@ properties([
 // Jenkinsfile, so bumping the tag with a parameter required a manual "Build
 // with Parameters" round-trip every time. Keep this as a plain script var so
 // every commit that bumps the tag takes effect on the next /build comment.
-def ciImage = 'gitlab-master.nvidia.com:5005/epeer/nova-test/nova-kernel-ci:2026-05-13-4'
+def ciImage = 'gitlab-master.nvidia.com:5005/epeer/nova-test/nova-kernel-ci:2026-05-14'
 
 def runUid = params.RUN_AS_UID?.trim()
 def runGid = params.RUN_AS_GID?.trim()

ci/Dockerfile

@@ -56,7 +56,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     jq \
     gawk \
     openssh-client \
-    python3-minimal \
+    python3 \
     binutils \
     time \
     && rm -rf /var/lib/apt/lists/*