use script instead

.woodpecker/main.yml

@@ -19,16 +19,10 @@ clone:
 
 pipeline:
   check-tag:
-    image: code.balsillie.net/containers/debian:11-slim-bash
+    image: debian:11-slim
     pull: false
     commands:
-      - if [[ $TAG =~ ^v1\...\..rc.$ ]]; then
-          echo "Tag ${TAG} appears to be a release candidate, terminating build." && exit 1
-        elif [[ $TAG =~ ^v1\...\..$ ]]; then
-          echo "Tag ${TAG} appears to be a release tag, proceeding." && exit 0
-        else
-          echo "Unable to determine nature of tag, terminating build." && exit 1
-        fi
+      - /bin/bash check-tag.sh
   clone-source:
     image: docker:git
     commands: 

check-tag.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+if [[ $TAG =~ ^v1\...\..rc.$ ]]; then
+  echo "Tag ${TAG} appears to be a release candidate, terminating build."
+  exit 1
+elif [[ $TAG =~ ^v1\...\..$ ]]; then
+  echo "Tag ${TAG} appears to be a release tag, proceeding."
+  exit 0
+else
+  echo "Unable to determine nature of tag, terminating build."
+  exit 1
+fi