update ci configuration

.woodpecker.yml

@@ -1,15 +1,21 @@
+variables:
+  - &golang "golang:1.19"
+
 pipeline:
   test:
-    image: golang:1.19
+    image: *golang
     commands:
       - go test -v
 
   build:
-    image: golang:1.19
+    image: *golang
+    environment:
+      TAG: ${CI_COMMIT_TAG:-latest}
     commands:
       - go build
       - ART=/artifacts/deblan/capture
       - test -d $ART || mkdir $ART
-      - cp capture $ART/capture-${CI_COMMIT_SHA:0:8}
+      - cp capture $ART/capture-latest
+      - test -z ${CI_COMMIT_TAG} && cp capture $ART/capture-$TAG || true
     volumes:
       - /var/www/html/artifacts:/artifacts