Add a little documentation, make self-contained by downloading tools

Signed-off-by: Knut Ahlers <knut@ahlers.me>

.gitignore

@@ -1 +1,3 @@
 config.json
+envrun_*
+yq_*

Makefile

@@ -1,17 +1,20 @@
-ALPINE_VERSION:=3.17.0
-PACKER_VERSION:=1.8.4-r2
+ALPINE_VERSION:=3.17
+PACKER_VERSION:=1.8.4-r3
 ANSIBLE_CORE_VERSION:=2.13.6-r0
 JQ_VERSION:=1.6-r2
 
+ENVRUN_VERSION:=v0.6.2
+YQ_VERSION:=v4.31.2
+
 export DOCKER_BUILDKIT:=1
 
 default:
 
-config.json:
-	yq -ojson . config.yaml | jq -S . >config.json
+config.json: yq_$(YQ_VERSION)
+	./yq_$(YQ_VERSION) -ojson . config.yaml | jq -S . >config.json
 
-create-snapshot: docker-build config.json
-	envrun -- docker run --rm -i \
+create-snapshot: docker-build config.json envrun_$(ENVRUN_VERSION)
+	./envrun_$(ENVRUN_VERSION) -- docker run --rm -i \
 		-e "HCLOUD_TOKEN" \
 		-v "$(CURDIR):/config:ro" \
 		registry.local/alpine-on-hetzner:latest \
@@ -26,4 +29,14 @@ docker-build:
 		-t registry.local/alpine-on-hetzner \
 		./alpine-on-hetzner
 
+# --- Tools
+
+envrun_$(ENVRUN_VERSION):
+	curl -sSfL "https://github.com/Luzifer/envrun/releases/download/$(ENVRUN_VERSION)/envrun_linux_amd64.tar.gz" | tar -xz
+	mv envrun_linux_amd64 $@
+
+yq_$(YQ_VERSION):
+	curl -sSfLo $@ "https://github.com/mikefarah/yq/releases/download/$(YQ_VERSION)/yq_linux_amd64"
+	chmod +x $@
+
 .PHONY: config.json

README.md

@@ -0,0 +1,8 @@
+# Luzifer / hetzner-alpine-k8s
+
+This repo contains my configuration for the [MathiasPius/alpine-on-hetzner](https://github.com/MathiasPius/alpine-on-hetzner) build tooling.
+
+## Usage
+
+- Create an `.env` file containing an `HCLOUD_TOKEN=someimportanttoken`
+- Execute `make create-snapshot`