Multiple Admin Interface fixes and some others.

Misc:
- Fixed hadolint workflow, new git cli needs some extra arguments.
- Add ignore paths to all specific on triggers.
- Updated hadolint version.
- Made SMTP_DEBUG read-only, since it can't be changed at runtime.

Admin:
- Migrated from Bootstrap v4 to v5
- Updated jquery to v3.6.0
- Updated Datatables
- Made Javascript strict
- Added a way to show which ENV Vars are overridden.
- Changed the way to provide data for handlebars.
- Fixed date/time check.
- Made support string use details and summary feature of markdown/github.

src/static/scripts/datatables.css

@@ -4,13 +4,18 @@
  *
  * To rebuild or modify this file with the latest versions of the included
  * software please visit:
- *   https://datatables.net/download/#bs4/dt-1.10.23
+ *   https://datatables.net/download/#bs5/dt-1.10.25
  *
  * Included libraries:
- *   DataTables 1.10.23
+ *   DataTables 1.10.25
  */
 
 @charset "UTF-8";
+/*! Bootstrap 5 integration for DataTables
+ *
+ * ©2020 SpryMedia Ltd, all rights reserved.
+ * License: MIT datatables.net/license/mit
+ */
 table.dataTable {
   clear: both;
   margin-top: 6px !important;
@@ -105,7 +110,7 @@ table.dataTable > thead .sorting_asc_disabled:after,
 table.dataTable > thead .sorting_desc_disabled:before,
 table.dataTable > thead .sorting_desc_disabled:after {
   position: absolute;
-  bottom: 0.9em;
+  bottom: 0.5em;
   display: block;
   opacity: 0.3;
 }
@@ -193,18 +198,27 @@ table.dataTable.table-sm .sorting_desc:after {
 table.table-bordered.dataTable {
   border-right-width: 0;
 }
+table.table-bordered.dataTable thead tr:first-child th,
+table.table-bordered.dataTable thead tr:first-child td {
+  border-top-width: 1px;
+}
 table.table-bordered.dataTable th,
 table.table-bordered.dataTable td {
   border-left-width: 0;
 }
+table.table-bordered.dataTable th:first-child, table.table-bordered.dataTable th:first-child,
+table.table-bordered.dataTable td:first-child,
+table.table-bordered.dataTable td:first-child {
+  border-left-width: 1px;
+}
 table.table-bordered.dataTable th:last-child, table.table-bordered.dataTable th:last-child,
 table.table-bordered.dataTable td:last-child,
 table.table-bordered.dataTable td:last-child {
   border-right-width: 1px;
 }
-table.table-bordered.dataTable tbody th,
-table.table-bordered.dataTable tbody td {
-  border-bottom-width: 0;
+table.table-bordered.dataTable th,
+table.table-bordered.dataTable td {
+  border-bottom-width: 1px;
 }
 
 div.dataTables_scrollHead table.table-bordered {