| Fix the following issue: |
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| EODataAccessGateway constructor fails on AWS Lambda |
| **Describe the bug**
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| `makedirs` [invocation](https://github.com/CS-SI/eodag/blob/develop/eodag/api/core.py#L98) within the EODataAccessGateway constructor causes `OSError: [Errno 30] Read-only file system` when run on AWS Lambda
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| **Code To Reproduce**
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| CLI commands or Python code snippet to reproduce the bug. Please use maximum verbosity using:
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| ```py
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| from aws_lambda_powertools.logging import Logger
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| from aws_lambda_powertools.tracing import Tracer
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| from eodag import EODataAccessGateway
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|
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| logger = Logger()
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| tracer = Tracer()
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| @tracer.capture_lambda_handler
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| @logger.inject_lambda_context
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| def lambda_handler(event, context):
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| EODataAccessGateway()
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| ```
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| **Output**
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| Compete output obtained with maximal verbosity.
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|
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| ```
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| [ERROR] OSError: [Errno 30] Read-only file system: '/home/sbx_user1051'
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| Traceback (most recent call last):
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| File "/opt/python/aws_lambda_powertools/tracing/tracer.py", line 305, in decorate
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| response = lambda_handler(event, context, **kwargs)
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| File "/opt/python/aws_lambda_powertools/logging/logger.py", line 438, in decorate
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| return lambda_handler(event, context, *args, **kwargs)
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| File "/var/task/<my file, my line>, in lambda_handler
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| EODataAccessGateway()
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| File "/opt/python/eodag/api/core.py", line 91, in __init__
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| makedirs(self.conf_dir)
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| File "/opt/python/eodag/utils/__init__.py", line 496, in makedirs
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| os.makedirs(dirpath)
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| File "/var/lang/lib/python3.9/os.py", line 215, in makedirs
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| makedirs(head, exist_ok=exist_ok)
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| File "/var/lang/lib/python3.9/os.py", line 215, in makedirs
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| makedirs(head, exist_ok=exist_ok)
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| File "/var/lang/lib/python3.9/os.py", line 225, in makedirs
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| mkdir(name, mode)
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| ```
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| **Environment:**
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| - Python version: 3.9
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| - EODAG version: 2.5.2
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| - Runtime: AWS Lambda
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| **Additional context**
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| File system on AWS Lambda is read-only. It has "ephemeral storage" that could be accessed in `/tmp` ([1](https://aws.amazon.com/blogs/aws/aws-lambda-now-supports-up-to-10-gb-ephemeral-storage/), [2](https://aws.amazon.com/blogs/aws/aws-lambda-now-supports-up-to-10-gb-ephemeral-storage/)), however this class does not accept any configuration to where to point to `makedirs`.
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| The workaround that heavily relies on the [current implementation](https://github.com/CS-SI/eodag/blob/develop/eodag/api/core.py#L97) is to change `$HOME` env var before invoking the constructor. But it is barely acceptable and extremely inconvenient, since this variable is used by many tools locally and in automated tools along the way. |
