Support for Alpine based Nextcloud images

[yareg-com]

I tried to setup nextcloud-cronjob with nextcloud:19-fpm-alpine image and got this error:

OCI runtime exec failed: exec failed: container_linux.go:349: starting container process caused "exec: "bash": executable file not found in $PATH": unknown

I think this is because Alpine OS uses sh instead of bash. It would be great to have this supported.

[rcdailey]

Interesting issue. I will look into it.

[rcdailey]

Please read the documentation on the newly added environment variables NEXTCLOUD_EXEC_SHELL and NEXTCLOUD_EXEC_SHELL_ARGS. In your case please use NEXTCLOUD_EXEC_SHELL=sh. The args variable already defaults to -c. Again, documentation has more detail and examples.

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