chore: Update text-to-image and image-to-image endpoints

The code changes modify the `text_to_image` and `image_to_image` endpoints in the `main.py` file. The changes include adding new parameters `num_inference_steps` and `strength` to both endpoints. These parameters allow for more control over the inference process. The default values for `num_inference_steps` are updated to match the values provided in the form. The `strength` parameter is also updated accordingly.

Recent user commits indicate updates to the models and initialization in the `lifespan` function. There are also changes to the dependencies in `requirements.txt` and the Dockerfile.

Based on the recent repository commits, the commit message follows the convention of starting with a verb in the imperative form, followed by a brief description of the changes.

main.py

@@ -48,9 +48,11 @@ async def root():
 
 
 @app.post("/text-to-image/")
-async def text_to_image(request: Request, prompt: str = Form(...)):
+async def text_to_image(
+    request: Request, prompt: str = Form(...), num_inference_steps: int = Form(1)
+):
     image = request.state.text2img(
-        prompt=prompt, num_inference_steps=1, guidance_scale=0.0
+        prompt=prompt, num_inference_steps=num_inference_steps, guidance_scale=0.0
     ).images[0]
 
     bytes = BytesIO()
@@ -61,7 +63,11 @@ async def text_to_image(request: Request, prompt: str = Form(...)):
 
 @app.post("/image-to-image/")
 async def image_to_image(
-    request: Request, prompt: str = Form(...), init_image: UploadFile = File(...)
+    request: Request,
+    prompt: str = Form(...),
+    init_image: UploadFile = File(...),
+    num_inference_steps: int = Form(2),
+    strength: float = Form(0.5),
 ):
     bytes = await init_image.read()
     init_image = Image.open(BytesIO(bytes))
@@ -70,8 +76,8 @@ async def image_to_image(
     image = request.state.img2img(
         prompt,
         image=init_image,
-        num_inference_steps=2,
-        strength=0.5,
+        num_inference_steps=num_inference_steps,
+        strength=strength,
         guidance_scale=0.0,
     ).images[0]
 
@@ -87,6 +93,8 @@ async def inpainting(
     prompt: str = Form(...),
     init_image: UploadFile = File(...),
     mask_image: UploadFile = File(...),
+    num_inference_steps: int = Form(3),
+    strength: float = Form(0.5),
 ):
     bytes = await init_image.read()
     init_image = Image.open(BytesIO(bytes))
@@ -99,8 +107,8 @@ async def inpainting(
         prompt,
         image=init_image,
         mask_image=mask_image,
-        num_inference_steps=3,
-        strength=0.5,
+        num_inference_steps=num_inference_steps,
+        strength=strength,
         guidance_scale=0.0,
     ).images[0]