diff --git a/Dockerfile b/Dockerfile
index d1737fe..405335e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,6 +7,7 @@ RUN apt-get update && apt-get -y install \
   bash \
   build-essential \
   bzip2 \
+  ca-certificates \
   curl \
   file \
   git \
@@ -22,24 +23,25 @@ RUN apt-get update && apt-get -y install \
   tar \
   vim \
   wget \
-  xz-utils
+  xz-utils && \
+  apt-get -y clean
 
 # Build and install CMake from source.
 WORKDIR /usr/src
 RUN git clone git://cmake.org/cmake.git CMake && \
   cd CMake && \
-  git checkout v3.4.3
-RUN mkdir CMake-build
-WORKDIR /usr/src/CMake-build
-RUN /usr/src/CMake/bootstrap \
+  git checkout v3.4.3 && \
+  cd .. && mkdir CMake-build && \
+  /usr/src/CMake/bootstrap \
     --parallel=$(nproc) \
     --prefix=/usr && \
   make -j$(nproc) && \
   ./bin/cmake -DCMAKE_USE_SYSTEM_CURL:BOOL=ON \
+    -DCMAKE_BUILD_TYPE:STRING=Release \
     -DCMAKE_USE_OPENSSL:BOOL=ON . && \
   make install && \
-  rm -rf *
-WORKDIR /usr/src
+  cd .. && \
+  rm -rf CMake*
 
 # Build and install Ninja from source
 RUN git clone https://github.com/martine/ninja.git && \
@@ -47,4 +49,5 @@ RUN git clone https://github.com/martine/ninja.git && \
   git checkout v1.6.0 && \
   python ./configure.py --bootstrap && \
   ./ninja && \
-  cp ./ninja /usr/bin/
+  cp ./ninja /usr/bin/ && \
+  cd .. && rm -rf ninja
diff --git a/README.md b/README.md
deleted file mode 100644
index 98250e9..0000000
--- a/README.md
+++ /dev/null
@@ -1,4 +0,0 @@
-cross-compilers
-===============
-
-Dockerfiles for cross compiling environments
diff --git a/README.rst b/README.rst
new file mode 100644
index 0000000..fd7af0e
--- /dev/null
+++ b/README.rst
@@ -0,0 +1,14 @@
+cross-compilers
+===============
+Dockerfiles for cross compiling environments
+--------------------------------------------
+
+.. image:: https://circleci.com/gh/thewtex/cross-compilers/tree/master.svg?style=svg
+  :target: https://circleci.com/gh/thewtex/cross-compilers/tree/master
+
+.. |base-images| image:: https://badge.imagelayers.io/thewtex/cross-compiler-base:latest.svg
+  :target: https://imagelayers.io/?images=thewtex/cross-compiler-base:latest
+
+thewtex/cross-compiler-base
+  |base-images| Base image for other toolchain images. From Debian Jessie with GCC,
+  make, autotools, CMake, Ninja, Git, and Python.
diff --git a/circle.yml b/circle.yml
new file mode 100644
index 0000000..5596e62
--- /dev/null
+++ b/circle.yml
@@ -0,0 +1,19 @@
+machine:
+  services:
+    - docker
+
+dependencies:
+  override:
+    - docker info
+    - docker pull thewtex/cross-compiler-base
+
+test:
+  override:
+    - make base
+
+deployment:
+  hub:
+    branch: master
+    commands:
+      - docker login -e $DOCKER_EMAIL -u $DOCKER_USER -p $DOCKER_PASS
+      - docker push thewtex/cross-compiler-base