feat: build custom caddy with gopkg module

.concourse/pipeline.yml

@@ -27,4 +27,3 @@ jobs:
         file: ci-images.git/.concourse/tasks/caddy.yml
         input_mapping:
           repo: ci-images.git
-          caddy: caddy-release

.concourse/tasks/caddy.yml

@@ -10,8 +10,6 @@ image_resource:
 inputs:
   - name: repo
     path: .
-  - name: caddy
-    path: caddy/caddy-release
 
 params:
   GITEA_USER: ((gitea-credentials.user))

caddy/.gitignore

@@ -1 +0,0 @@
-caddy-release/

caddy/Dockerfile

@@ -1,9 +1,14 @@
-FROM gcr.io/distroless/static
+FROM docker.io/caddy:builder-alpine AS builder
 
-ADD caddy-release/caddy_*_linux_amd64.tar.gz /usr/local/caddy
+RUN xcaddy build \
+    --with magnax.ca/caddy/gopkg
+
+FROM gcr.io/distroless/static AS final
+
+COPY --from=builder /usr/bin/caddy /usr/bin/caddy
 COPY config/caddy.json /etc/caddy/caddy.json
 
 EXPOSE 3000
 
-ENTRYPOINT [ "/usr/local/caddy/caddy" ]
+ENTRYPOINT [ "/usr/bin/caddy" ]
 CMD [ "run", "--config=/etc/caddy/caddy.json" ]