Add integration test for Linux with Nvidia GPU. #3884 (#3895)

* Add linux integration test.

* Fix directory path.

* Add paths ignore.

* Fix conda env directory path.

.github/conda-environments/linux-environment.yml

@@ -0,0 +1,28 @@
+name: comfyui
+channels:
+  - pytorch
+  - nvidia
+  - defaults
+dependencies:
+  - python>=3.9
+  - pip
+  - pytorch
+  - torchvision
+  - torchaudio
+  - pytorch-cuda=12.1
+  - pip:
+    # comfyui requirements
+    - einops
+    - transformers>=4.25.1
+    - safetensors>=0.4.2
+    - aiohttp
+    - pyyaml
+    - Pillow
+    - scipy
+    - tqdm
+    - psutil
+    # comfy-action requirements
+    - requests
+    - google-cloud-storage
+    - comfy-cli
+    - charset-normalizer