Skip the is_fs_supported failure test on CI

All VFS backends are enabled in release tarballs so this test will fail
on GitHub Actions. Normally folks don't compile HDFS in locally so we'll
still keep the check for when folks are working locally.

tiledb/api/src/context.rs

@@ -192,7 +192,13 @@ mod tests {
         // enabled. These tests failing most likely means a non "standard"
         // build of libtiledb.{so,dylib,dll}
         assert!(ctx.is_supported_fs(ffi::Filesystem::MEMFS));
-        assert!(!ctx.is_supported_fs(ffi::Filesystem::HDFS));
+
+        // On GitHub Actions, we use the release tarball which enables all
+        // backends. Thus we skip this test when running in CI.
+        let var = std::env::var("GITHUB_ACTIONS").unwrap_or(String::from(""));
+        if var != *"true" {
+            assert!(!ctx.is_supported_fs(ffi::Filesystem::HDFS));
+        }
     }
 
     #[test]