Docker: Remove /opt/requirements.txt after pip installation.

Author: brycelelbach

tutorials/accelerated-python/brev/dockerfile

@@ -13,6 +13,7 @@ COPY tutorials/${ACH_TUTORIAL}/brev/requirements.txt /opt/requirements.txt
 RUN set -ex \
  && `# Install Python packages` \
       && pip install --no-cache-dir --root-user-action=ignore -r /opt/requirements.txt \
+      && rm -f /opt/requirements.txt \
  && `# Install system packages` \
       && apt-get update -y \
       && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends git-lfs \

tutorials/cuda-cpp/brev/dockerfile

@@ -12,6 +12,7 @@ COPY tutorials/${ACH_TUTORIAL}/brev/requirements.txt /opt/requirements.txt
 RUN set -ex \
  && `# Install Python packages` \
      && pip install --no-cache-dir --root-user-action=ignore -r /opt/requirements.txt \
+     && rm -f /opt/requirements.txt \
  && `# Install system packages` \
      && apt-get update -y \
      && apt-get install -y --no-install-recommends ffmpeg git-lfs \

tutorials/stdpar/brev/docker-recipe.py

@@ -96,6 +96,7 @@
   # Install Python packages
   'pip install --no-cache-dir --upgrade pip',
   'pip install --no-cache-dir --root-user-action=ignore -r /opt/requirements.txt',
+  'rm -f /opt/requirements.txt',
 
   # Build and install AdaptiveCpp
   'git clone --depth=1 --shallow-submodules --recurse-submodules -b develop https://github.com/AdaptiveCpp/AdaptiveCpp',