Add Woodpecker CI pipeline for Docker build and deployment

This commit adds a new `.woodpecker.yml` file with settings for building and deploying Docker images using the `woodpeckerci/plugin-docker-buildx` image. The `Dockerfile` has also been updated to install `curl`, Deno, and deployctl.

.woodpecker.yml

@@ -0,0 +1,13 @@
+pipeline:
+  alpine:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      repo: lttech/deno-deployctl
+      platforms: linux/amd64,linux/arm64/v8
+      tags:
+        - ${version}-${os}
+      build_args:
+        - tag=${version}-${os}
+      username: lttech
+      password:
+        from_secret: docker_lttech

Dockerfile

@@ -0,0 +1,4 @@
+FROM alpine
+RUN apk add curl
+RUN curl -fsSL https://deno.land/x/install/install.sh | sh
+RUN deno install --allow-all --no-check -r -f https://deno.land/x/deploy/deployctl.ts