Build sslip.io Dockerfiles for both ARM64 & AMD64

...because, hey, I have a Mac, and native is about 10x faster than amd64
emulation. Also because it's cool.

I had to compile my own version of Concourse's
[`registry-image`](https://github.com/concourse/registry-image-resource)
container image because the one shipped with Concourse 7.8.3 is old and
doesn't have the multi-platform feature:

```
docker build --build-arg base_image=ubuntu -t cunnie/registry-image -f dockerfiles/ubuntu/Dockerfile
```

Switch Alpine → Fedora to address weird connection issue:

```
 > [linux/arm64 3/3] RUN wget https://github.com/cunnie/sslip.io/releases/download/2.6.0/sslip.io-dns-server-linux-arm64     -O /usr/sbin/sslip.io-dns-server;   chmod 755 /usr/sbin/sslip.io-dns-server:
Connecting to github.com (192.30.255.113:443)
wget: error getting response: Connection reset by peer
```

[#21]

ci/pipeline-sslip.io.yml

@@ -36,7 +36,7 @@ jobs:
       DOMAIN: sslip.io
 - name: build-and-push-sslip.io-dns-server
   plan:
-  - get: sslip.io-release
+  - get: sslip.io
     trigger: true
   - task: build-task-image
     privileged: true
@@ -47,20 +47,23 @@ jobs:
         source:
           repository: concourse/oci-build-task
       inputs:
-      - name: sslip.io-release
+      - name: sslip.io
       outputs:
       - name: image
       params:
-        CONTEXT: sslip.io-release/k8s/
-        DOCKERFILE: sslip.io-release/k8s/Dockerfile-sslip.io-dns-server
+        CONTEXT: sslip.io/k8s/
+        DOCKERFILE: sslip.io/k8s/Dockerfile-sslip.io-dns-server
+        IMAGE_PLATFORM: linux/arm64,linux/amd64
+        OUTPUT_OCI: true
       run:
         path: build
   - put: sslip.io-dns-server
     params:
-      image: image/image.tar
+      image: image/image
+
 - name: build-and-push-k-v.io-nginx
   plan:
-  - get: sslip.io-release
+  - get: sslip.io
     trigger: true
   - task: build-task-image
     privileged: true
@@ -71,20 +74,23 @@ jobs:
         source:
           repository: concourse/oci-build-task
       inputs:
-      - name: sslip.io-release
+      - name: sslip.io
       outputs:
       - name: image
       params:
-        CONTEXT: sslip.io-release/k8s/
-        DOCKERFILE: sslip.io-release/k8s/Dockerfile-k-v.io-nginx
+        CONTEXT: sslip.io/k8s/
+        DOCKERFILE: sslip.io/k8s/Dockerfile-k-v.io-nginx
+        IMAGE_PLATFORM: linux/arm64,linux/amd64
+        OUTPUT_OCI: true
       run:
         path: build
   - put: k-v.io-nginx
     params:
-      image: image/image.tar
+      image: image/image
+
 - name: build-and-push-sslip.io-nginx
   plan:
-  - get: sslip.io-release
+  - get: sslip.io
     trigger: true
   - task: build-task-image
     privileged: true
@@ -95,32 +101,39 @@ jobs:
         source:
           repository: concourse/oci-build-task
       inputs:
-      - name: sslip.io-release
+      - name: sslip.io
       outputs:
       - name: image
       params:
-        CONTEXT: sslip.io-release/k8s/
-        DOCKERFILE: sslip.io-release/k8s/Dockerfile-sslip.io-nginx
+        CONTEXT: sslip.io/k8s/
+        DOCKERFILE: sslip.io/k8s/Dockerfile-sslip.io-nginx
+        IMAGE_PLATFORM: linux/arm64,linux/amd64
+        OUTPUT_OCI: true
       run:
         path: build
   - put: sslip.io-nginx
     params:
-      image: image/image.tar
+      image: image/image
+
+# Delete this once there's a [Concourse
+# release](https://github.com/concourse/concourse/releases) (v7.9 ?) which has
+# a new version (> 1.5.1) of the registry-image resource that has the
+# multi-platform (ARM & AMD) code.
+
+# Also, :%s/cunnie-registry-image/registry-image/
+resource_types:
+- name: cunnie-registry-image
+  type: registry-image
+  source:
+    repository: cunnie/registry-image
 
 resources:
-- name: sslip.io
-  type: git
-  icon: github
-  source:
-    uri: https://github.com/cunnie/sslip.io.git
-
 - name: every-six-hours
   type: time
   icon: clock
   source: {interval: 6h}
 
-# The repo with our sslip.io executable
-- name: sslip.io-release
+- name: sslip.io
   type: git
   icon: github
   source:
@@ -129,7 +142,7 @@ resources:
 
 # Where we will push the k-v.io nginx Docker image with HTML assets
 - name: k-v.io-nginx
-  type: registry-image
+  type: cunnie-registry-image
   icon: docker
   source:
     repository: cunnie/k-v.io-nginx
@@ -139,7 +152,7 @@ resources:
 
 # Where we will push the sslip.io nginx Docker image with HTML assets
 - name: sslip.io-nginx
-  type: registry-image
+  type: cunnie-registry-image
   icon: docker
   source:
     repository: cunnie/sslip.io-nginx
@@ -149,10 +162,11 @@ resources:
 
 # Where we will push the Docker image with the DNS server
 - name: sslip.io-dns-server
-  type: registry-image
+  type: cunnie-registry-image
   icon: docker
   source:
     repository: cunnie/sslip.io-dns-server
     username: cunnie
     password: ((docker_token))
     tag: latest
+

k8s/Dockerfile-delete-me

@@ -0,0 +1,8 @@
+#
+# cunnie/delete-me
+#
+# test Dockerfile
+#
+FROM alpine
+
+LABEL org.opencontainers.image.authors="Brian Cunnie <brian.cunnie@gmail.com>"

k8s/Dockerfile-sslip.io-dns-server

@@ -19,15 +19,15 @@
 #    dig +short 127.0.0.1.example.com @localhost -p 3353
 #    127.0.0.1
 #
-FROM alpine AS sslip.io
+FROM fedora
 
 LABEL org.opencontainers.image.authors="Brian Cunnie <brian.cunnie@gmail.com>"
 
-RUN apk update && apk add bind-tools
+RUN dnf install -y bind-utils
 
 ARG TARGETARCH # amd64, arm64 (so I can run on AWS graviton2)
-RUN wget https://github.com/cunnie/sslip.io/releases/download/2.6.0/sslip.io-dns-server-linux-$TARGETARCH \
-    -O /usr/sbin/sslip.io-dns-server; \
+RUN curl https://github.com/cunnie/sslip.io/releases/download/2.6.0/sslip.io-dns-server-linux-$TARGETARCH \
+    -o /usr/sbin/sslip.io-dns-server; \
   chmod 755 /usr/sbin/sslip.io-dns-server
 
 CMD ["/usr/sbin/sslip.io-dns-server"]