This is my latest build:

Using dockerignore file: /kaniko/snapshots/a03569d3-4b96-4344-9352-0935104767e8/.dockerignore
Retrieving image manifest python:3.12
Retrieving image python:3.12 from registry index.docker.io
Returning cached image manifest
Built cross stage deps: map[]
Returning cached image manifest
Returning cached image manifest
Executing 0 build triggers
Building stage 'python:3.12' [idx: '0', base-idx: '-1']
Checking for cached layer us-west1.registry.rlwy.net/b0bfc537-f787-4dae-8b51-3318878e297c/cache:b8f02b381bdddf091b663d8725a4ca61cd3d8fda568615312f9a8598e87f7fb5...
Using caching version of cmd: RUN pip install --no-cache-dir --upgrade -r /app/requirements.txt
Cmd: EXPOSE
Adding exposed port: 8080/tcp
Unpacking rootfs as cmd COPY ./requirements.txt /app/requirements.txt requires it.
WORKDIR /app
Creating directory /app with uid -1 and gid -1
Taking snapshot of files...
COPY ./requirements.txt /app/requirements.txt
Taking snapshot of files...
Found cached layer, extracting to filesystem
COPY . /app/
Taking snapshot of files...
Cmd: EXPOSE
No files changed in this command, skipping snapshotting.
CMD ["python", "main.py"]
No files changed in this command, skipping snapshotting.
Pushing image to us-west1.registry.rlwy.net/b0bfc537-f787-4dae-8b51-3318878e297c:4c5eb60a-a53e-47af-bb34-fc22817b8681
Pushed us-west1.registry.rlwy.net/b0bfc537-f787-4dae-8b51-3318878e297c@sha256:80775415bca9a702cd4561c5cbb9f8fdc3a14ee65abc93d85399e6ee8045351b

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Container failed to start

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crun: executable file `python main.py` not found in $PATH: No such file or directory: OCI runtime attempted to invoke a command that was not found

# Dockerfile
FROM python:3.12
WORKDIR /app
COPY ./requirements.txt /app/requirements.txt
RUN pip install --no-cache-dir --upgrade -r /app/requirements.txt
COPY . /app/
EXPOSE 8080
CMD ["python", "main.py"]

# .dockerignore
# folders
__pycache__/
venv/
tests/
# files
.tool-versions
Makefile
Procfile
*.md

[Region: us-west1]
=========================
Using Detected Dockerfile
=========================

context: 095f1fe4ff7671be65363f3221d87e2a
#0 building with "default" instance using docker driver

#1 [internal] load build definition from Dockerfile

#1 transferring dockerfile: 232B done
#1 DONE 0.0s

#2 [internal] load metadata for docker.io/library/python:3.12
#2 DONE 0.5s


#3 [internal] load .dockerignore
#3 transferring context: 122B done
#3 DONE 0.0s

#4 [1/5] FROM docker.io/library/python:3.12@sha256:4584ea46d313a10e849eb7c5ef36be14773418233516ceaa9e52a8ff7d5e35a5
#4 DONE 0.0s

#5 [2/5] WORKDIR /app
#5 CACHED

#6 [internal] load build context
#6 transferring context: 44.21kB done
#6 DONE 0.0s

#7 [3/5] COPY ./requirements.txt /app/requirements.txt
#7 DONE 0.0s

#8 [4/5] RUN pip install --no-cache-dir --upgrade -r /app/requirements.txt
#8 16.62 Successfully installed ...
#8 16.62 WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
#8 16.84
#8 16.84 [notice] A new release of pip is available: 24.0 -> 24.1
#8 16.84 [notice] To update, run: pip install --upgrade pip

#8 DONE 17.7s

#9 [5/5] COPY . /app/
#9 DONE 0.0s

#10 exporting to image
#10 exporting layers
#10 exporting layers 1.0s done
#10 writing image sha256:acb315253f53f1016a4cfa811d710f59eb5717ddef85a585f78ccdb736632ca3 done
#10 naming to us-west1.registry.rlwy.net/b0bfc537-f787-4dae-8b51-3318878e297c:fec12eec-1ed3-4c87-8a04-bd6505fa0de1 done
#10 DONE 1.0s

Build time: 19.55 seconds

================
Publishing Image
================

The push refers to repository [us-west1.registry.rlwy.net/b0bfc537-f787-4dae-8b51-3318878e297c]
Preparing  e548c9cb2c31
Pushed  1be284a6fc27
fec12eec-1ed3-4c87-8a04-bd6505fa0de1: digest: sha256:1b0ff133827437d018a01a31155def90310747155b8eeb2b65e8a6a29f4fdf66 size: 2841

Publish time: 8.36 seconds

=========================
Container failed to start
=========================

crun: unknown version specified: OCI runtime error

docker build -t visado-back .
[+] Building 0.8s (10/10) FINISHED                                                                                                                              docker:rootless
 => [internal] load build definition from Dockerfile
 => => transferring dockerfile: 239B
 => [internal] load metadata for docker.io/library/python:3.12-alpine
 => [internal] load .dockerignore
 => => transferring context: 122B
 => [1/5] FROM docker.io/library/python:3.12-alpine@sha256:44a5b997abb8de1ea47a4a91a81431f8dc8f789e2bf45530aa0db85344d70bad
 => [internal] load build context
 => => transferring context: 4.34kB
 => CACHED [2/5] WORKDIR /app
 => CACHED [3/5] COPY ./requirements.txt /app/requirements.txt
 => CACHED [4/5] RUN pip install --no-cache-dir --upgrade -r /app/requirements.txt
 => CACHED [5/5] COPY . /app/
 => exporting to image
 => => exporting layers
 => => writing image sha256:77047f10c1f953f8646bc1218ce3815561dd51c3bf6ebcd6550866337ee04de7
 => => naming to docker.io/library/visado-back
docker run --rm --name visado-back --publish 8080:8080 visado-back
INFO:     Started server process [1]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
INFO:     Uvicorn running on http://0.0.0.0:8080 (Press CTRL+C to quit)
^CINFO:     Shutting down
INFO:     Waiting for application shutdown.
INFO:     Application shutdown complete.
INFO:     Finished server process [1]