chore: temporarily enable docs build from main

docs/src/antora.yml

@@ -0,0 +1,19 @@
+# This file is temporary, since for the time being, we need to build docs from the main branch.
+# Remove when 1.16.0 is out, otherwise this file quickly becomes stale.
+name: timefold-solver
+title: Timefold Solver 1.15.0
+version: latest
+asciidoc:
+  attributes:
+    timefold-solver-version: 1.15.0
+    timefold-solver-python-version: 1.15.0b0
+    java-version: 17
+    maven-version: 3.9.2
+    python-version: '3.10'
+    quarkus-version: 3.15.1
+    spring-boot-version: 3.3.5
+    logback-version: 1.5.12
+    exec-maven-plugin-version: 3.3.1
+    rewrite-maven-plugin-version: 5.43.4
+nav:
+  - modules/ROOT/nav.adoc