Adding a dedicated curl image

curl/Dockerfile

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+FROM alpine:3.8
+
+LABEL "name"="curl"
+LABEL "maintainer"="Unacast <developers+github@unacast.com>"
+LABEL "version"="1.0.0"
+
+LABEL "com.github.actions.name"="curl"
+LABEL "com.github.actions.description"="run curl"
+LABEL "com.github.actions.icon"="terminal"
+LABEL "com.github.actions.color"="black"
+
+RUN apk add --no-cache --update curl
+ENTRYPOINT ["/usr/bin/curl"]

curl/Makefile

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+include ../docker.mk
+include ../help.mk
+include ../shell.mk
+
+.PHONY: clean
+clean: ## Clean up after the build process.
+
+.PHONY: lint
+lint: docker-lint ## Lint all of the files for this Action.
+
+.PHONY: build
+build: docker-build ## Build this Action.
+
+.PHONY: test
+test: ## Test the components of this Action.
+
+.PHONY: publish
+publish: docker-publish ## Publish this Action.