CI: Add script for running tests from github worklow (equinor#1296)

* CI: Add script for running tests from github worklow

* CI: Include roxar tests

* CI: Use xtgeo-testdata from cache

ci/testrmsenv.sh

@@ -0,0 +1,43 @@
+# This shell script is to be sourced and run from a github workflow
+# when xtgeo is to be tested towards a new RMS Python enviroment
+
+run_tests() {
+    set_test_variables
+
+    copy_test_files
+
+    install_test_dependencies
+
+    run_pytest
+}
+
+set_test_variables() {
+    echo "Setting variables for xtgeo tests..."
+    CI_TEST_ROOT=$CI_ROOT/xtgeo_test_root
+}
+
+copy_test_files () {
+    echo "Copy xtgeo test files to $CI_TEST_ROOT..."
+    mkdir -p $CI_TEST_ROOT
+    cp -r $PROJECT_ROOT/tests $CI_TEST_ROOT
+
+    echo "Create symlinks from $CI_TEST_ROOT to files in $PROJECT_ROOT..."    
+    ln -s $PROJECT_ROOT/examples $CI_TEST_ROOT/examples
+    ln -s $PROJECT_ROOT/conftest.py $CI_TEST_ROOT/conftest.py
+    ln -s $PROJECT_ROOT/pyproject.toml $CI_TEST_ROOT/pyproject.toml
+}
+
+install_test_dependencies () {
+    echo "Installing test dependencies..."
+    pip install ".[dev]"
+
+    echo "Dependencies installed successfully. Listing installed dependencies..."
+    pip list
+}
+
+run_pytest () {
+    echo "Running xtgeo tests with pytest..."
+    pushd $CI_TEST_ROOT
+    pytest ./tests -n 4 -vv --testdatapath $XTGEO_TESTDATA_PATH
+    popd
+}