Use Alpine-PHP Image to Reduce Security Issues

[LaurinStreng]

Change the Base Image of the Service to alpine because Debian, is using unnecessary features.

This has the effect:

Container Security Scan (trivy):

• Old Base Image: Total: 1992 (UNKNOWN: 20, LOW: 634, MEDIUM: 1142, HIGH: 190, CRITICAL: 6)
• New Base Image: Total: 0 (UNKNOWN: 0, LOW: 0, MEDIUM: 0, HIGH: 0, CRITICAL: 0)

Size:

• Old Image: 1.11GB
• New Image: 324MB

Fixes #925

[LaurinStreng]

Test with a Ldaps connection and the password change site.
Passwords can be changed, Site is working.

[LaurinStreng]

The only thing that is different in our "user" config. The Location from /etc/ldap/ldap.conf has changed to /etc/openldap/ldap.conf Also, the newer ca-cert module don't accept wildcard certs by Default, so we have to add TLS_REQCERT allow in our ldap.conf