`podman-compose up` fails if parent folder is not a valid tag format

**To Reproduce**
Steps to reproduce the behavior:
```bash
mkdir _test
cd _test
echo "FROM docker.io/nginx:latest" > Dockerfile
cat < compose.yaml
---
services:
nginx:
build: .
EOF
podman-compose up --build
```

**Output**

```console
$ python ../podman-compose/podman_compose.py up
podman-compose version: 1.0.7
['podman', '--version', '']
using podman version: 4.7.2
** excluding: set()
['podman', 'inspect', '-t', 'image', '-f', '{{.Id}}', '_test_nginx']
Error: invalid reference format
podman build -f /tmp/tmp.1d20dwmcrw/_test/Dockerfile -t _test_nginx /tmp/tmp.1d20dwmcrw/_test
Error: tag _test_nginx: invalid reference format
exit code: 125
['podman', 'ps', '--filter', 'label=io.podman.compose.project=_test', '-a', '--format', '{{ index .Labels "io.podman.compose.config-hash"}}']
podman pod create --name=pod__test --infra=false --share=
Error: adding pod to state: name "pod__test" is in use: pod already exists
exit code: 125
['podman', 'network', 'exists', '_test_default']
['podman', 'network', 'create', '--label', 'io.podman.compose.project=_test', '--label', 'com.docker.compose.project=_test', '_test_default']
Error: network name _test_default invalid: names must match [a-zA-Z0-9][a-zA-Z0-9_.-]*: invalid argument
Traceback (most recent call last):
File "/tmp/tmp.1d20dwmcrw/_test/../podman-compose/podman_compose.py", line 736, in assert_cnt_nets
compose.podman.output([], "network", ["exists", net_name])
File "/tmp/tmp.1d20dwmcrw/_test/../podman-compose/podman_compose.py", line 1169, in output
return subprocess.check_output(cmd_ls)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/subprocess.py", line 466, in check_output
return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/subprocess.py", line 571, in run
raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['podman', 'network', 'exists', '_test_default']' returned non-zero exit status 1.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/tmp/tmp.1d20dwmcrw/_test/../podman-compose/podman_compose.py", line 3209, in
main()
File "/tmp/tmp.1d20dwmcrw/_test/../podman-compose/podman_compose.py", line 3205, in main
podman_compose.run()
File "/tmp/tmp.1d20dwmcrw/_test/../podman-compose/podman_compose.py", line 1524, in run
retcode = cmd(self, args)
^^^^^^^^^^^^^^^
File "/tmp/tmp.1d20dwmcrw/_test/../podman-compose/podman_compose.py", line 1920, in wrapped
return func(*args, **kw)
^^^^^^^^^^^^^^^^^
File "/tmp/tmp.1d20dwmcrw/_test/../podman-compose/podman_compose.py", line 2254, in compose_up
podman_args = container_to_args(compose, cnt, detached=args.detach)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/tmp/tmp.1d20dwmcrw/_test/../podman-compose/podman_compose.py", line 960, in container_to_args
assert_cnt_nets(compose, cnt)
File "/tmp/tmp.1d20dwmcrw/_test/../podman-compose/podman_compose.py", line 779, in assert_cnt_nets
compose.podman.output([], "network", args)
File "/tmp/tmp.1d20dwmcrw/_test/../podman-compose/podman_compose.py", line 1169, in output
return subprocess.check_output(cmd_ls)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/subprocess.py", line 466, in check_output
return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/subprocess.py", line 571, in run
raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['podman', 'network', 'create', '--label', 'io.podman.compose.project=_test', '--label', 'com.docker.compose.project=_test', '_test_default']' returned non-zero exit status 125.
```

**Environment:**
- OS: Linux 6.6.1-arch1-1
- podman version: 4.7.2
- podman compose version: 1.0.6 (f6dbce3) and latest (bce40c2)

Start in podman_compose.py around compose_up, container_to_args, and assert_cnt_nets, then reproduce the failure with the documented mkdir, Dockerfile, compose.yaml, and podman-compose up --build commands. Trace how the _test project name becomes image, pod, and network names; done means the same compose project starts successfully when its parent folder begins with an underscore.

Written by the indexing model from the issue text.