tinyobjloader: add run_tests.sh (#13609)

Adds run_tests.sh to the tinyobjloader project.

run_tests.sh is used as part of Chronos with cached builds:
https://github.com/google/oss-fuzz/tree/master/infra/experimental/chronos#check-tests

`infra/experimental/chronos/check_tests.sh tinyobjloader c`

```
...
SUCCESS: All unit tests have passed.
```

Signed-off-by: Adam Korczynski <adam@adalogics.com>

Author: AdamKorcz

projects/tinyobjloader/Dockerfile

@@ -16,5 +16,5 @@
 
 FROM gcr.io/oss-fuzz-base/base-builder
 RUN git clone --depth 1 https://github.com/tinyobjloader/tinyobjloader
-COPY build.sh $SRC
+COPY build.sh run_tests.sh $SRC
 WORKDIR $SRC/tinyobjloader

projects/tinyobjloader/build.sh

@@ -15,7 +15,6 @@
 #
 ################################################################################
 
-
 # build project
 mkdir build && cd build
 cmake .. -DBUILD_SHARED_LIBS=OFF

projects/tinyobjloader/run_tests.sh

@@ -0,0 +1,17 @@
+#!/bin/bash -eu
+# Copyright 2025 Google LLC.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+cd $SRC/tinyobjloader/tests && make check