execute pipeline on tag + save

.drone.yml

@@ -1,7 +1,11 @@
 ---
 kind: pipeline
 type: docker
-name: default
+name: build-release
+
+when:
+  event:
+    - tag
 
 steps:
 
@@ -10,24 +14,18 @@ steps:
   commands:
   - git submodule init
   - git submodule update --recursive --remote
-  when:
-    event: tag
 
 - name: pandoc
   image: pandoc/alpine:2.14
   commands:
     - sh build-pandoc.sh latex user > user-manual.tex
     - sh build-pandoc.sh latex admin > user-manual.tex
-  when:
-    event: tag
 
 - name: build-latex
   image: ghcr.io/xu-cheng/texlive-full:latest
   commands:
     - latexmk -pdf -file-line-error -halt-on-error -interaction=nonstopmode -xelatex user-manual.tex
     - latexmk -pdf -file-line-error -halt-on-error -interaction=nonstopmode -xelatex latex-manual.tex
-  when:
-    event: tag
 
 - name: release
   image: plugins/gitea-release
@@ -42,5 +40,8 @@ steps:
       - sha512
     title: ${DRONE_COMMIT_REF}
     prerelease: true
-  when:
-    event: tag
+---
+kind: signature
+hmac: 3bfa17ee6ad33613ca8e2fec573050a6d65d3b89e2a0c49f28dbb51b8461a427
+
+...