build(python): switch to pipx for better virtual env isolation

Author: thomasleplus

aws-cli/Dockerfile

@@ -36,7 +36,6 @@ RUN dnf upgrade -y \
     wget-1.21.3-1.amzn2023.0.4 \
     xz-5.2.5-9.amzn2023.0.2 \
     zip-3.0-28.amzn2023.0.2 \
-    && IFS=$'\n\t' \
     && if dnf upgrade -y | tee -a /dev/stderr | grep -q -e '^Nothing to do.' ; then \
        exit 1 ; \
     fi \
@@ -47,7 +46,7 @@ RUN dnf upgrade -y \
 # FIXME @TL --break-system-packages not supported until Python 3.11.
 RUN pip3 install --no-cache-dir --upgrade \
     pipx==1.7.1 \
-    && pip3 list --outdated | tee -a /dev/stderr | grep -q -e '^pipx ' ; then \
+    && if pip3 list --outdated | tee -a /dev/stderr | grep -q -e '^pipx ' ; then \
        exit 1 ; \
     fi