diff --git a/.woodpecker.yml b/.woodpecker.yml
new file mode 100644
index 0000000..972ceee
--- /dev/null
+++ b/.woodpecker.yml
@@ -0,0 +1,22 @@
+pipeline:
+  publish:
+    image: plugins/docker
+    registry: registry.nulo.in
+    repo: registry.nulo.in/sutty/containers-gem-compiler
+    tags:
+    - ${ALPINE_VERSION}
+    - latest
+    build_args:
+    - ALPINE_VERSION=${ALPINE_VERSION}
+    - BASE_IMAGE=registry.nulo.in/sutty/containers-sdk-ruby
+    username: sutty
+    secrets:
+    - docker_password
+    when:
+      branch: antifascista
+      event: push
+
+matrix:
+  ALPINE_VERSION:
+  - 3.13.6
+  - 3.14.2
diff --git a/Dockerfile b/Dockerfile
index 62e451e..7e029f8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,6 @@
-FROM sutty/sdk-ruby:latest
+ARG  BASE_IMAGE=sutty/sdk-ruby
+ARG  ALPINE_VERSION=3.13.6
+FROM ${BASE_IMAGE}:${ALPINE_VERSION}
 MAINTAINER "f <f@sutty.nl>"
 
 ENV GEM=none