fix: Linux Core Service docker file was missing a dependency (#1758)

Co-authored-by: pyansys-ci-bot <92810346+pyansys-ci-bot@users.noreply.github.com>

Author: RobPasMue

doc/changelog.d/1758.fixed.md

@@ -0,0 +1 @@
+Linux Core Service docker file was missing a dependency

docker/linux/coreservice/Dockerfile

@@ -11,6 +11,7 @@ RUN apt-get update && \
     apt-get install -y --no-install-recommends unzip=6.* && \
     apt-get install -y --no-install-recommends gcc=4:12.2.* && \
     apt-get install -y --no-install-recommends mono-mcs=6.8.0.* && \
+    apt-get install -y --no-install-recommends libgfortran5=12.2.* && \
     rm -rf /var/lib/apt/lists/*
 
 # Add the binary files from the latest release