App Templates: How to handle optional environment variables?

[technorabilia]

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I only want to set the environment variable if necessary, similar to the JAVA_OPTS variable that you see below, which is only needed when adding something; otherwise, it shouldn't be set at all.

What App template JSON format should I use for this?

I use the following App template URL:
https://raw.githubusercontent.com/technorabilia/test/main/templates-3.0.json

For Airsonic-advanced I have the following environment variables:

From the App template JSON file which is clearly wrong because I cannot get rid of the variable in the UI:

                                {
					"name": "CONTEXT_PATH",
					"label": "CONTEXT_PATH",
					"default": "",
					"description": "For setting url-base in reverse proxy setups."
				},
				{
					"name": "JAVA_OPTS",
					"label": "JAVA_OPTS",
					"default": "",
					"description": "For passing additional java options."
				}

[technorabilia]

I'm wondering if this is a viable workaround or the recommended way to do this:

• Remove the optional environment variables from the App template (e.g., CONTEXT_PATH and JAVA_OPTS in the example above).
• Deploy the container without these optional environment variables.
• Open the container details and select the Duplicate/Edit option.
• Navigate to Advanced container settings and then to the Env section.
• Add or remove the optional environment variables as needed.
• Deploy the container again and select Replace.

Any feedback is appreciated.

[technorabilia]

Any other options available? Or is this the only way? Thanks!

[technorabilia]

Apparently this is a bug in the latest Portainer releases?

#12337 (comment)