Pin exact Haploflow version

Note that I am using a specific commit version for pinning.
Rationalization:

Haploflow is not developed actively, and because of that,
the last release is quite far behind master.

Thus, I think it's better to pin its version to the current master
than to the latest release tag.

.github/workflows/build-and-test.yml

@@ -22,7 +22,9 @@ jobs:
           sudo apt-get install -y build-essential git ronn
           cd /opt/
           git clone https://github.com/hzi-bifo/Haploflow
-          cd /opt/Haploflow && sh build.sh
+          cd Haploflow
+          git checkout 9a5a0ff6c3a0435e723e41f98fe82ec2ad19cf50
+          sh build.sh
           sudo ln -s /opt/Haploflow/build/haploflow ~/bin/haploflow
 
       - name: Install IVA assembler dependencies

Dockerfile

@@ -85,9 +85,11 @@ RUN apt-get install -q -y zlib1g-dev libncurses5-dev libncursesw5-dev && \
 
 ## Install Haploflow
 RUN apt-get install -y build-essential sudo git ronn \
-    cd /opt/ &&
-    git clone https://github.com/hzi-bifo/Haploflow \
-    cd /opt/Haploflow && sh build.sh \
+    cd /opt/ && \
+    git clone https://github.com/hzi-bifo/Haploflow && \
+    cd Haploflow && \
+    git checkout 9a5a0ff6c3a0435e723e41f98fe82ec2ad19cf50 && \
+    sh build.sh && \
     ln -s /opt/Haploflow/build/haploflow /bin/haploflow
 
 ## Install dependencies for genetracks/drawsvg