static page builder for ci

static-page-builder/Dockerfile

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+# maybe switch to a stable version of alpine once tidyhtml is avaiblable there
+FROM alpine:edge
+
+# py3-pip is only needed to install j2cli, but python3 and py3-setuptools are
+# also needed to run it
+RUN apk add --no-cache \
+        findutils \
+        make \
+        py3-pip \
+        py3-setuptools \
+        python3 \
+        sassc \
+        tidyhtml && \
+    pip install j2cli[yaml] && \
+    apk del py3-pip

static-page-builder/Makefile

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+IMG_NAME=static-page-builder
+REGISTRY=registry.monotremata.xyz
+IMG=$(REGISTRY)/$(IMG_NAME)
+PLATFORMS=linux/amd64,linux/arm64
+
+.PHONY: build push buildx
+
+build: Dockerfile
+	docker build -t $(IMG) .
+
+push: build
+	docker image push $(IMG)
+
+buildx: Dockerfile
+	docker buildx build \
+		--platform $(PLATFORMS) \
+		--tag $(IMG) \
+		--push \
+		.