Wrong unstructured image for docker compose

[asterbini]

Description

The unstructured image used in docker-compose.yml misses the web server and exits immediately.
The correct image is downloads.unstructured.io/unstructured-io/unstructured-api:latest (instead than downloads.unstructured.io/unstructured-io/unstructured:latest)

Once this is fixed, the .env var should be set to (no https, and port 8000)
UNSTRUCTURED_API_URL=http://unstructured:8000/general/v0/general

Finally, keeping the UNSTRUCTURED_API_KEY empy to use unstructured only locally raises an error because goldenverba/components/reader/UnstructuredAPI.py makes it mandatory

I suggest making it optional to enable local-only processing
E.g. by changing goldenverba/components/util.py

diff --git a/goldenverba/components/util.py b/goldenverba/components/util.py
index f376e25..5b98b6c 100644
--- a/goldenverba/components/util.py
+++ b/goldenverba/components/util.py
@@ -46,16 +46,17 @@ def pca(X, k):
     return X_pca


-def get_environment(config, value: str, env: str, error_msg: str) -> str:
+def get_environment(config, value: str, env: str, error_msg: str, optional : bool = False) -> str:
     if value in config:
         token = config[value].value
     else:
         token = os.environ.get(env)
     if not token or token == "":
+        if optional: return ""
         raise Exception(error_msg)
     return token

 def get_token(env: str, default: str = None) -> str:
     # return token, but treat empty string als None
     token = tok if bool(tok := os.getenv(env, None)) else default

and by changing goldenverba/components/reader/UnstructuredAPI.py

diff --git a/goldenverba/components/reader/UnstructuredAPI.py b/goldenverba/components/reader/UnstructuredAPI.py
index 57c8648..13cde49 100644
--- a/goldenverba/components/reader/UnstructuredAPI.py
+++ b/goldenverba/components/reader/UnstructuredAPI.py
@@ -40,6 +40,7 @@ class UnstructuredReader(Reader):
                 value="",
                 description="Set your Unstructured API Key here or set it as an environment variable `UNSTRUCTURED_API_KEY`",
                 values=[],
+                optional=True,
             )

         if os.getenv("UNSTRUCTURED_API_URL") is None:
@@ -62,6 +63,7 @@ class UnstructuredReader(Reader):
             "API Key",
             "UNSTRUCTURED_API_KEY",
             "No Unstructured API Key detected",
+            optional=True,
         )
         api_url = get_environment(
             config, "API URL", "UNSTRUCTURED_API_URL", "No Unstructured URL detected"