chore: add workflow_dispatch to most github actions

.github/workflows/dockerhub.yml

@@ -1,6 +1,7 @@
 name: dockerhub publish
 
 on:
+  workflow_dispatch:
   release:
     types: published
   repository_dispatch:

.github/workflows/documentation.yml

@@ -1,6 +1,7 @@
 name: documentation
 
 on:
+  workflow_dispatch:
   push:
     branches:
       - master

.github/workflows/freebsd.yml

@@ -1,8 +1,9 @@
 name: FreeBSD tests
 
 on:
-    pull_request:
-        types: [labeled, synchronize]
+  workflow_dispatch:
+  pull_request:
+    types: [labeled, synchronize]
 
 jobs:
   freebsd: