CI for multiarch.

.dockerignore

@@ -1,5 +1,3 @@
 .gitignore
 example/
-arch.txt
-buildx.sh
 readme.md

.gitignore

@@ -1,2 +1 @@
-arch.txt
-buildx.sh
+

ci/pipeline.yml

@@ -0,0 +1,113 @@
+# ---
+# resources:
+# - name: every-week
+#   type: time
+#   icon: clock-outline
+#   source:
+#     interval: 168h
+# - name: source
+#   type: git
+#   source:
+#     uri: https://gitea.redxef.at/redxef/nginx-envsubst
+#     branch: master
+# - name: image
+#   type: registry-image
+#   source:
+#     username: ((docker.username))
+#     password: ((docker.password))
+#     repository: redxef/nginx-envsubst
+#     tag: latest
+
+
+# jobs:
+# - name: build-push
+#   plan:
+#   - get: every-week
+#     trigger: true
+#   - get: source
+#     trigger: true
+#   - task: build
+#     privileged: true
+#     config:
+#       platform: linux
+#       image_resource:
+#         type: registry-image
+#         source:
+#           repository: concourse/oci-build-task
+#       inputs:
+#       - name: source
+#         path: .
+#       params:
+#         IMAGE_PLATFORM: linux/amd64
+#       outputs:
+#       - name: image
+#       run:
+#         path: build
+#   - put: image
+#     params:
+#       image: image/image.tar
+
+
+---
+resources:
+- name: source
+  type: git
+  source:
+    uri: https://gitea.redxef.at/redxef/nginx-envsubst
+    branch: master
+- name: upstream-image
+  type: registry-image
+  source:
+    repository: alpine
+
+jobs:
+- name: build-push
+  plan:
+  - get: source
+    trigger: true
+  - get: upstream-image
+    trigger: true
+  - task: compute-docker-tags
+    config:
+      platform: linux
+      image_resource:
+        type: registry-image
+        source:
+          repository: alpine/git
+      inputs:
+      - name: source
+        path: .
+      outputs:
+      - name: docker-tags
+      run:
+        path: sh
+        args:
+        - -c
+        - |
+          #!/usr/bin/env sh
+          git rev-parse --short HEAD > docker-tags/tags.txt
+  - task: build
+    privileged: true
+    config:
+      platform: linux
+      image_resource:
+        type: registry-image
+        source:
+          repository: redxef/concourse-buildkit
+      inputs:
+      - name: source
+        path: .
+      - name: docker-tags
+      params:
+        username: ((docker.username))
+        password: ((docker.password))
+        repository: docker.io/redxef/nginx-envsubst
+        tag: latest
+        additional_tags: docker-tags/tags.txt
+        push: true
+        platform: aarch64,arm,i386,ppc64le,s390x,x86_64
+        context: .
+        manual: false
+      run:
+        path: build
+