perf: updated Dockerfile to optimize requirements installation and de…

…pendency caching

.github/workflows/push-enterprise-subsidy-image.yaml

@@ -9,6 +9,11 @@ on:
   schedule:
     - cron: "0 4 * * 1-5"  # UTC Time
 
+#  Added for testing purposes. Will remove once the PR is finalised
+  pull_request:
+    branches:
+      - '**'
+
 jobs:
   build-and-push-image:
     runs-on: ubuntu-latest

dockerfiles/enterprise-subsidy.Dockerfile

@@ -54,7 +54,7 @@ RUN apt-get update && apt-get -qy install --no-install-recommends \
  python3-pip \
  python${PYTHON_VERSION} \
  python${PYTHON_VERSION}-dev \
- python${PYTHON_VERSION}-distutils 
+ python${PYTHON_VERSION}-distutils
 
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
 
@@ -65,8 +65,7 @@ RUN rm -rf /var/lib/apt/lists/*
 RUN curl -sS https://bootstrap.pypa.io/get-pip.py | python${PYTHON_VERSION}
 RUN pip install virtualenv
 
-# cloning git repo
-RUN curl -L https://github.com/openedx/enterprise-subsidy/archive/refs/heads/main.tar.gz | tar -xz --strip-components=1
+RUN mkdir -p requirements
 
 # Create a virtualenv for sanity
 ENV VIRTUAL_ENV=/edx/venvs/enterprise-subsidy
@@ -83,11 +82,18 @@ EXPOSE 18280
 RUN useradd -m --shell /bin/false app
 
 # Dependencies are installed as root so they cannot be modified by the application user.
+
+RUN curl -L -o requirements/pip.txt https://raw.githubusercontent.com/openedx/enterprise-subsidy/main/requirements/pip.txt
+RUN curl -L -o requirements/production.txt https://raw.githubusercontent.com/openedx/enterprise-subsidy/main/requirements/production.txt
+
 RUN pip install -r requirements/pip.txt
 RUN pip install -r requirements/production.txt
 
 RUN mkdir -p /edx/var/log
 
+# cloning git repo
+RUN curl -L https://github.com/openedx/enterprise-subsidy/archive/refs/heads/main.tar.gz | tar -xz --strip-components=1
+
 # Code is owned by root so it cannot be modified by the application user.
 # So we copy it before changing users.
 USER app