Move to env variable opt out

Signed-off-by: Ryan Levick <ryan.levick@fermyon.com>

Author: rylev

.github/workflows/build.yml

@@ -170,6 +170,8 @@ jobs:
       - name: Run Integration Tests
         run: |
           make test-integration
+        env:
+          SPIN_CONFORMANCE_TESTS_DOCKER_OPT_OUT: true
         # Only run integration tests on macOS as they will be run on ubuntu separately
         if: ${{ matrix.runner == 'macos-14' }}
 

tests/conformance-tests/src/lib.rs

@@ -16,15 +16,15 @@ pub fn run_test(
                 services.push("tcp-echo");
             }
             conformance_tests::config::Precondition::Redis => {
-                if is_docker_installed() {
+                if should_run_docker_based_tests() {
                     services.push("redis")
                 } else {
                     // Skip the test if docker is not installed.
                     return Ok(());
                 }
             }
             conformance_tests::config::Precondition::Mqtt => {
-                if is_docker_installed() {
+                if should_run_docker_based_tests() {
                     services.push("mqtt")
                 } else {
                     // Skip the test if docker is not installed.
@@ -73,10 +73,6 @@ pub fn run_test(
 }
 
 /// Whether or not docker is installed on the system.
-fn is_docker_installed() -> bool {
-    std::process::Command::new("docker")
-        .arg("--version")
-        .output()
-        .map(|output| output.status.success())
-        .unwrap_or(false)
+fn should_run_docker_based_tests() -> bool {
+    std::env::var("SPIN_CONFORMANCE_TESTS_DOCKER_OPT_OUT").is_err()
 }