[CI] Misc Buildbot Container Fixes

The buildbot container was missing a couple dependencies that were needed
to get the worker actually started.

The buildbot deployment also had the RAM specified in Mi, but 1024Mi gets
turned into 1Gi by k8s which then confuses terraform as it thinks the state
is inconsistent.

Author: boomanaiden154

premerge/buildbot/Dockerfile

@@ -1,5 +1,9 @@
 FROM ubuntu:24.04
-RUN apt-get update && apt-get install -y python3 python3-pip
+RUN apt-get update && apt-get install -y \
+  python3 \
+  python3-pip \
+  git \
+  python-is-python3
 COPY requirements.lock.txt /requirements.lock.txt
 RUN pip3 install --break-system-packages -r /requirements.lock.txt && rm /requirements.lock.txt
 RUN mkdir /app

premerge/buildbot_deployment.yaml

@@ -30,5 +30,5 @@ spec:
             memory: "512Mi"
             cpu: "500m"
           limits:
-            memory: "1024Mi"
+            memory: "1Gi"
             cpu: "750m"