initialize docker packer image

.env

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+REGISTRY_URL=docker.registry
+IMAGE_NAME=packer-builder
+VERSION=1.0.0

.gitignore

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+# ignore file for git
+
+*.iso
+*.tar
+*.bz2

Makefile

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+.PHONY: up
+
+up:
+	docker-compose up --build -d

docker-compose.yml

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+version: '3.7'
+
+services:
+   gentoo_packer:
+      image: ${REGISTRY_URL}/${IMAGE_NAME}:${VERSION}
+      build: 
+         context: ./packer
+      entrypoint: "bash -c"
+      command: "'while sleep 3600; do :; done'"
+      stdin_open: true
+      tty: true
+      volumes:
+         - "./assets:/packer/"

packer/Dockerfile

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+FROM hashicorp/packer:1.5.1
+
+RUN apk add --update qemu qemu-system-x86_64 qemu-img
+RUN find / -iname '*qemu*'
+
+ENV PACKER_LOG=1
+
+ENTRYPOINT ["/bin/packer"]
+
+