chore: Remove redundant capability SYS_PTRACE (#2624)

* chore: Remove `SYS_PTRACE` capability from docs and configs
* chore: Remove `SYS_PTRACE` capability from tests

Doesn't seem to be required. It was originally added when the original change detection feature PR apparently needed it to function.

docs/content/config/advanced/full-text-search.md

@@ -83,7 +83,6 @@ While indexing is memory intensive, you can configure the plugin to limit the am
           stop_grace_period: 1m
           cap_add:
             - NET_ADMIN
-            - SYS_PTRACE
     ```
 
 3. Recreate containers:

docs/content/config/advanced/kubernetes.md

@@ -199,7 +199,6 @@ spec:
                 - NET_BIND_SERVICE
                 # miscellaneous  capabilities
                 - SYS_CHROOT
-                - SYS_PTRACE
                 - KILL
               drop: [ALL]
             seccompProfile:

docs/content/examples/tutorials/basic-installation.md

@@ -61,7 +61,6 @@ In this setup `docker-mailserver` is not intended to receive email externally, s
               - SPOOF_PROTECTION=0
             cap_add:
               - NET_ADMIN # For Fail2Ban to work
-              - SYS_PTRACE
         ```
 
     - The docs have a detailed page on [Environment Variables][docs-environment] for reference.