Simplified run_ci_tests.sh to run within a Gitlab runner context

bin/run_ci_tests.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-BASE_DIR="$(mktemp -d)"
+BASE_DIR="$(mktemp -d '/tmp/platypush-ci-tests-XXXXX')"
 VENV_DIR="$BASE_DIR/venv"
 REPO_DIR="$BASE_DIR/repo"
 TEST_LOG="$BASE_DIR/test.log"
@@ -16,19 +16,18 @@ prepare_venv() {
     python -m venv "$VENV_DIR"
     cd "$VENV_DIR"
     source ./bin/activate
+    cd -
 }
 
 install_repo() {
     echo "Installing latest version of the repository"
-    git clone "$REPO_URL" "$REPO_DIR"
-    cd "$REPO_DIR"
     pip install '.[http]'
 }
 
 run_tests() {
     echo "Running tests"
-    cd "$REPO_DIR"
     pytest 2>&1 | tee "$TEST_LOG"
+
     grep -e '^FAILED ' "$TEST_LOG"
     if [[ $? == 0 ]]; then
         return 2  # FAILURE