add git in docker build for submodule installation

compose/local/django/Dockerfile

@@ -12,6 +12,8 @@ ARG BUILD_ENVIRONMENT=local
 RUN apt-get update && apt-get install --no-install-recommends -y \
   # dependencies for building Python packages
   build-essential \
+  # git
+  git \
   # psycopg2 dependencies
   libpq-dev
 
@@ -41,6 +43,8 @@ RUN apt-get update && apt-get install --no-install-recommends -y \
   libpq-dev \
   # Translations dependencies
   gettext \
+  # git for submodules
+  git \
   # cleaning up unused files
   && apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false \
   && rm -rf /var/lib/apt/lists/*

compose/production/django/Dockerfile

@@ -14,6 +14,8 @@ ARG BUILD_ENVIRONMENT=production
 RUN apt-get update && apt-get install --no-install-recommends -y \
   # dependencies for building Python packages
   build-essential \
+  # git for submodules
+  git \
   # psycopg2 dependencies
   libpq-dev
 
@@ -47,6 +49,8 @@ RUN apt-get update && apt-get install --no-install-recommends -y \
   libpq-dev \
   # Translations dependencies
   gettext \
+  # git for submodules
+  git \
   # cleaning up unused files
   && apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false \
   && rm -rf /var/lib/apt/lists/*