Add changelog entry for PR precice#829

Author: PranjalManhgaye

changelog-entries/829.md

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+- Parallelized pull-request system tests via a GitHub Actions matrix over `release_test_shard_1` and `release_test_shard_2` [#829](https://github.com/precice/tutorials/pull/829)

heat-exchanger/download-meshes.sh

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+#!/usr/bin/env sh
+
+echo "This tutorial is based on a case prepared with SimScale."
+echo "Since the mesh files are several MB large, we don't store them in the Git repository."
+echo "This script downloads and extracts the missing files."
+echo ""
+
+echo "Downloading the Solid case..."
+wget -nv -O - https://syncandshare.lrz.de/dl/fi3c9Xt5UzBc5hJvXzsLBHXn/Solid.tar.gz | tar -xzv
+mv ./Solid/* solid-calculix
+rm -r ./Solid
+sed -i 's/Solid/\./g' solid-calculix/solid.inp
+
+echo "Downloading and extracting the Inner-Fluid mesh..."
+wget -nv -O - https://syncandshare.lrz.de/dl/fiNsYGC1DKzgio4jS5NhsXg7/polyMesh.org.tar.gz | tar -xzv -C fluid-inner-openfoam/constant
+mv fluid-inner-openfoam/constant/polyMesh.org fluid-inner-openfoam/constant/polyMesh
+
+echo "Downloading and extracting the Outer-Fluid mesh..."
+wget -nv -O - https://syncandshare.lrz.de/dl/fiEZRQ8rcVWRkoyZvANim1R1/polyMesh.org.tar.gz | tar -xzv -C fluid-outer-openfoam/constant
+mv fluid-outer-openfoam/constant/polyMesh.org fluid-outer-openfoam/constant/polyMesh
+
+echo "Completed."