[CICD] Github workflow for publishing Docker images (#764)

# What does this PR do?

- Add Github workflow for publishing docker images. 
- Manual Inputs
- We can use a (1) TestPyPi version / (2) build via released PyPi
version

**Notes**
- Keep this workflow manually triggered as we don't want to publish
nightly docker images

**Additional Changes**
- Resolve issue with running llama stack build in non-terminal device
```
  File "/home/runner/.local/lib/python3.12/site-packages/llama_stack/distribution/utils/exec.py", line 25, in run_with_pty
    old_settings = termios.tcgetattr(sys.stdin)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
termios.error: (25, 'Inappropriate ioctl for device')
```
- Modified build_container.sh to work in non-terminal environment


## Test Plan

- Triggered workflow:
3562217878
<img width="1076" alt="image"
src="https://github.com/user-attachments/assets/f1b5cef6-05ab-49c7-b405-53abc9264734"
/>


- Tested published docker image
<img width="702" alt="image"
src="https://github.com/user-attachments/assets/e7135189-65c8-45d8-86f9-9f3be70e380b"
/>


- /tools API endpoints are served so that docker is correctly using the
TestPyPi package
<img width="296" alt="image"
src="https://github.com/user-attachments/assets/bbcaa7fe-c0a4-4d22-b600-90e3c254bbfd"
/>

- Published tagged images:
https://hub.docker.com/repositories/llamastack
<img width="947" alt="image"
src="https://github.com/user-attachments/assets/2a0a0494-4d45-4643-bc29-72154ecc54a5"
/>


## Sources

Please link relevant resources if necessary.


## Before submitting

- [ ] This PR fixes a typo or improves the docs (you can dismiss the
other checks if that's the case).
- [ ] Ran pre-commit to handle lint / formatting issues.
- [ ] Read the [contributor
guideline](https://github.com/meta-llama/llama-stack/blob/main/CONTRIBUTING.md),
      Pull Request section?
- [ ] Updated relevant documentation.
- [ ] Wrote necessary unit or integration tests.

llama_stack/distribution/build.py

@@ -6,6 +6,7 @@
 
 import importlib.resources
 import logging
+import sys
 from enum import Enum
 
 from pathlib import Path
@@ -20,7 +21,7 @@ from llama_stack.distribution.distribution import get_provider_registry
 
 from llama_stack.distribution.utils.config_dirs import BUILDS_BASE_DIR
 
-from llama_stack.distribution.utils.exec import run_with_pty
+from llama_stack.distribution.utils.exec import run_command, run_with_pty
 from llama_stack.providers.datatypes import Api
 
 log = logging.getLogger(__name__)
@@ -102,7 +103,10 @@ def print_pip_install_help(providers: Dict[str, List[Provider]]):
     print()
 
 
-def build_image(build_config: BuildConfig, build_file_path: Path):
+def build_image(
+    build_config: BuildConfig,
+    build_file_path: Path,
+):
     docker_image = build_config.distribution_spec.docker_image or "python:3.10-slim"
 
     normal_deps, special_deps = get_provider_dependencies(
@@ -144,7 +148,12 @@ def build_image(build_config: BuildConfig, build_file_path: Path):
     if special_deps:
         args.append("#".join(special_deps))
 
-    return_code = run_with_pty(args)
+    is_terminal = sys.stdin.isatty()
+    if is_terminal:
+        return_code = run_with_pty(args)
+    else:
+        return_code = run_command(args)
+
     if return_code != 0:
         log.error(
             f"Failed to build target {build_config.name} with return code {return_code}",