(fix) Fix collabora regex and secContext, move validation docs to per app (#1078)

* Better regex on collabora

* bump collabora

* Move per-app validation to per-app docs

* Update valid_chars and allowPrivEsc on collabora

* revert bump

docs/apps/stable/collabora-online/validation.md

@@ -0,0 +1,30 @@
+# Input Validation
+
+__`Domain(s) using collabora`__
+Accepted formats are:
+
+- Single domain (eg. `cloud.mydomain.com`)
+- Multiple domains (eg. `cloud.mydomain.com|nextcloud.mydomain.com`) - Each domain is separated with `|`
+
+Regex used to match those: `^([a-z]{1,}\.[a-z]{1,}\.[a-z]{1,})((\|[a-z]{1,}\.[a-z]{1,}\.[a-z]{1,}))*$`
+You can try live [here](https://regex101.com/r/AQFh2g/1)
+
+__`Server Name`__
+Accepted formats are:
+
+- Single domain (eg. `collabora.mydomain.com`)
+
+Regex used to match this: `^([a-z]{1,}\.[a-z]{1,}\.[a-z]{1,})$`
+You can try live [here](https://regex101.com/r/xCjpW7/1)
+
+__`Password for WebUI`__
+Accepted formats are:
+
+- Letters, Numbers, Symbols, Minimum 8 characters (eg. `dg523$*a`) - It accepts `a-z`, `A-Z`, `0-9` and `!@#$%^&*?`
+
+Regex used to match those: `[a-zA-Z0-9!@#$%^&*?]{8,}`
+You can try live [here](https://regex101.com/r/ef3V88/1)
+
+---
+
+_If you find a field that you think it needs validation, please open an issue on github_