Add debug docker container for jf-live-writer

This container is meant to run and test the jf-live-writer
locally without the need to install the PHDF5 library in
your local environment. Follow the instructions in
the README file.

.dockerignore

@@ -0,0 +1,4 @@
+cmake-build-*/
+docker/
+docs/
+scripts/

jf-live-writer/README.md

@@ -3,6 +3,16 @@
 The jf-live-writer is packaged as a Docker container for development and 
 testing.
 
+# Using the docker container
+The easiest way to build and test the jf-live-writer is to use the 
+provided docker container. You need to start it from the project **root**:
+
+```bash
+docker build -f jf-live-writer/debug.Dockerfile -t jf-live-writer .
+```
+(Running this command from the project root is mandatory as the entire project 
+folder needs to be part of the build context.)
+
 ## Building
 In order to build this executable you need to specify the cmake variable
 ```

jf-live-writer/debug.Dockerfile

@@ -0,0 +1,10 @@
+FROM paulscherrerinstitute/sf-daq_phdf5:1.0.0
+
+COPY . /sf_daq_buffer/
+
+RUN mkdir /sf_daq_buffer/build && \
+    cd /sf_daq_buffer/build && \
+    cmake3 -DBUILD_JF_LIVE_WRITER=ON .. && \
+    make jf-live-writer
+
+WORKDIR /sf_daq_buffer/build