Cleanup apt-update files after installation

repo2docker/buildpacks/r.py

@@ -257,22 +257,17 @@ class RBuildPack(PythonBuildPack):
         scripts = [
             (
                 "root",
-                r"""
+                rf"""
                 apt-get update > /dev/null && \
                 apt-get install --yes --no-install-recommends \
                         libclang-dev \
-                        libzmq3-dev > /dev/null
-                """,
-                # apt-get -qq purge && \
-                # apt-get -qq clean && \
-                # rm -rf /var/lib/apt/lists/*
-            ),
-            (
-                "root",
-                rf"""
+                        libzmq3-dev > /dev/null && \
                 wget --quiet -O /tmp/r-{self.r_version}.deb https://cdn.rstudio.com/r/ubuntu-1804/pkgs/r-{self.r_version}_1_amd64.deb && \
-                apt install --yes --no-install-recommends /tmp/r-{self.r_version}.deb && \
+                apt install --yes --no-install-recommends /tmp/r-{self.r_version}.deb > /dev/null && \
                 rm /tmp/r-{self.r_version}.deb && \
+                apt-get -qq purge && \
+                apt-get -qq clean && \
+                rm -rf /var/lib/apt/lists/* && \
                 ln -s /opt/R/{self.r_version}/bin/R /usr/local/bin/R && \
                 ln -s /opt/R/{self.r_version}/bin/Rscript /usr/local/bin/Rscript && \
                 R --version