addci: add shellcheck

.woodpecker/lint.yml

@@ -8,6 +8,7 @@ steps:
       event:
         exclude:
           - tag
+
   hadolint:
     image: pipelinecomponents/hadolint:0.26.0@sha256:7122937006c7a9bcbb78ce764d3c2f0092f183b843ad128bc9fd6ea918e22d5b
     commands:
@@ -16,3 +17,20 @@ steps:
       event:
         exclude:
           - tag
+
+  shellcheck:
+    image: registry.mgrote.net/allzweckcontainer
+    commands:
+      - |
+        if find . -type f -not -path '/.git/' -exec file {} ; | grep -q "shell script"; then
+          find . -type f -not -path '/.git/' -exec file {} ; | grep "shell script" | awk -F':' '{print $1}' | xargs -n1 shellcheck || echo "hallo"
+          exit 1
+        else
+          echo "No files specified."
+          exit 0
+        fi
+    when:
+      event:
+        exclude:
+          - tag
+...