CI: Make smt2_solver available to all regression tests

We will want to use the solver for more than just selected CBMC
regressions.

Author: tautschnig

.github/workflows/pull-request-checks.yaml

@@ -72,9 +72,10 @@ jobs:
           make TAGS="[!shouldfail]" -C jbmc/unit test IPASIR=$PWD/riss.git/riss
       - name: Run regression tests
         run: |
+          export PATH=$PATH:`pwd`/src/solvers
           make -C regression test-parallel JOBS=${{env.linux-vcpus}} LIBS="$PWD/riss.git/release/lib/libriss-coprocessor.a -lpthread" IPASIR=$PWD/riss.git/riss
           make -C regression/cbmc test-paths-lifo
-          env PATH=$PATH:`pwd`/src/solvers make -C regression/cbmc test-cprover-smt2
+          make -C regression/cbmc test-cprover-smt2
           make -C jbmc/regression test-parallel JOBS=${{env.linux-vcpus}}
       - name: Check cleanup
         run: |
@@ -153,9 +154,10 @@ jobs:
           make TAGS="[!shouldfail]" -C jbmc/unit test
       - name: Run regression tests
         run: |
+          export PATH=$PATH:`pwd`/src/solvers
           make -C regression test-parallel JOBS=${{env.linux-vcpus}}
           make -C regression/cbmc test-paths-lifo
-          env PATH=$PATH:`pwd`/src/solvers make -C regression/cbmc test-cprover-smt2
+          make -C regression/cbmc test-cprover-smt2
           make -C jbmc/regression test-parallel JOBS=${{env.linux-vcpus}}
 
   # This job has been copied from the one above it, and modified to only build CBMC
@@ -339,9 +341,10 @@ jobs:
           make TAGS="[!shouldfail]" -C jbmc/unit test
       - name: Run regression tests
         run: |
+          export PATH=$PATH:`pwd`/src/solvers
           make -C regression test-parallel JOBS=${{env.linux-vcpus}}
           make -C regression/cbmc test-paths-lifo
-          env PATH=$PATH:`pwd`/src/solvers make -C regression/cbmc test-cprover-smt2
+          make -C regression/cbmc test-cprover-smt2
           make -C jbmc/regression test-parallel JOBS=${{env.linux-vcpus}}
 
   # This job takes approximately 17 to 41 minutes
@@ -689,7 +692,9 @@ jobs:
       - name: Run JBMC unit tests
         run: cd jbmc/unit; ./unit_tests
       - name: Run regression tests
-        run: make -C regression test-parallel JOBS=4
+        run: |
+          export PATH=$PATH:`pwd`/src/solvers
+          make -C regression test-parallel JOBS=4
       - name: Run JBMC regression tests
         run: make -C jbmc/regression test-parallel JOBS=4