add smt solvers to github actions

.github/workflows/dlsmt.sh

@@ -0,0 +1,73 @@
+# No shebang!
+
+## Weigl's little helper to download SMT-solvers. 
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# This script is meant to be executed inside an Github Action to download the SMT-solver. 
+# It uses the Github cli tool "gh", which allows an easy access to the releases of a
+# repository, and to download it artifacts. 
+#
+# This script will always the latest uploaded artifact.
+#
+#
+# For performance, you should consider caching. This script skips downloading if files are present.
+
+
+## Github workflow commands
+#  Please have a look at https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions
+#  which explains a lot of workflow commands and special files in Github Actions. 
+
+
+## TODO 
+# It would be nice to convert it into a real! Github action, which can also exploit 
+# the API library of Github. A manual/tutorial is here:
+#
+# https://docs.github.com/en/actions/creating-actions/developing-a-third-party-cli-action
+
+mkdir smt-solvers
+cd smt-solvers
+
+
+#################################################
+echo "::group::{install z3}"
+echo "Check for Z3, if present skip installation"
+
+if readlink -f */bin/z3; then 
+  echo "::notice::{Z3 found. Caching works! Skip installation}"
+else 
+  echo "Download Z3"
+  gh release download --skip-existing -p 'z3-*-x64-glibc-*.zip' -R Z3Prover/z3
+  unzip -n z3*.zip
+  rm z3-*-x64-glibc-*.zip  
+fi
+
+Z3=$(readlink -f */bin/z3)
+chmod u+x $Z3
+echo "Z3 added to path: $Z3"
+echo $(dirname $Z3) >> $GITHUB_PATH
+
+echo "::endgroup::"
+#################################################
+
+#################################################
+echo "::group::{install cvc5}"
+if -f cvc5-Linux; then 
+  echo "::notice::{Z3 found. Caching works! Skip installation}"
+else 
+  echo "Install CVC5"
+  gh release download --skip-existing -p 'cvc5-Linux' -R cvc5/cvc5  
+fi 
+
+CVC5=$(readlink -f cvc5-Linux)
+echo "CVC5 installed and added to path: CVC5"
+chmod u+x $CVC5
+echo $(dirname $CVC5) >> $GITHUB_PATH
+
+echo "::endgroup::"
+#################################################
+
+echo "::group::{check installation/versions}"
+$Z3 --version
+
+$CVC5 --version
+echo "::endgroup::"

.github/workflows/tests.yml

@@ -33,5 +33,8 @@ jobs:
                 with:
                     java-version: 21
                     distribution: 'corretto'
+            -   name: Install SMT-Solvers
+                run: .github/dlsmt.sh
+                shell: bash                    
             -   name: "Verify with KeY ${{ matrix.target }}"
                 run: make ${{ matrix.target }}