Fixing usage of envvar

.woodpecker/build-deploy.yaml

@@ -1,7 +1,6 @@
 variables:
   # https://hub.docker.com/r/alpine/git/tags
   - &GIT_VERSION "alpine/git:v2.30.1"
-  - PDF_BRANCH: "pdf"
 
 steps:
   - name: build_tex
@@ -66,7 +65,9 @@ steps:
     environment:
       SSH_KEY:
         from_secret: SSH-KEY
+      PDF_BRANCH: "pdf"
+
     when:
       - path:
-          include: ["*.tex"]
+          include: ["*.tex", ".woodpecker/*.yaml", ".woodpecker/*.yml"]
         event: [push, pull_request, manual, cron]