refactor: sign multiple images instead of only one

Signed-off-by: Vojtěch Mareš <vojtech@mares.cz>

.woodpecker/release.yaml

@@ -51,7 +51,7 @@ steps:
     commands:
       - echo $COSIGN_KEY > ./cosign.key
 
-  check-cosign-key:
-    image: alpine
-    commands:
-      - ls
+  sign-next:
+    image: registry.mareshq.com/woodpecker-plugins/cosign-sign:next
+    settings:
+      image: registry.mareshq.com/woodpecker-plugins/cosign-sign:next

Dockerfile

@@ -1,6 +1,6 @@
 FROM alpine:3.22
 
-RUN apk add --no-cache ca-certificates cosign
+RUN apk add --no-cache ca-certificates cosign jq
 
 COPY entrypoint.sh /entrypoint.sh
 

docs.md

@@ -18,12 +18,14 @@ steps:
   prettier:
     image: registry.mareshq.com/woodpecker-plugins/cosign-sign
     settings:
-      image: registry.example.com/app:latest
+      images:
+        - registry.example.com/app:latest
+        - registry.example.com/app:v1
 ```
 
 ## Settings
 
 | Settings Name | Type    | Default | Description                                                                 |
 | ------------- | ------- | ------- | --------------------------------------------------------------------------- |
-| `image`       | string | empty    | Image name including tag. |
+| `images`       | string | empty    | List of image names including tag. |
 | `key_path`       | string | `./cosign.key`    | Path to signing key |

entrypoint.sh

@@ -1,8 +1,10 @@
 #! /bin/sh
 
-if [ -z ${PLUGIN_IMAGE+x} ]; then
-    echo "ERROR: image setting is required."
+if [ -z ${PLUGIN_IMAGES+x} ]; then
+    echo "ERROR: images setting is required."
     exit 1
 fi
 
-cosign sign --key "${PLUGIN_KEY_PATH:-"./cosign.key"}" "${PLUGIN_IMAGE}"
+echo "${PLUGIN_IMAGES}" | jq '.[]' | while read -r image; do
+    cosign sign --key "${PLUGIN_KEY_PATH:-"./cosign.key"}" "${image}"
+done