Renew build, update docker and inner-runner

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

Dockerfile

@@ -1,13 +1,9 @@
-FROM debian
+FROM debian:stretch
 
-ENV REPO_RUNNER_VERSION=v0.11.0 \
-    DOCKER_VERSION=17.09.0-ce
-
-ADD https://github.com/Luzifer/repo-runner/releases/download/${REPO_RUNNER_VERSION}/inner-runner_linux_amd64 /usr/local/bin/inner-runner
+LABEL maintainer Knut Ahlers <knut@ahlers.me>
 
+COPY build.sh /usr/local/bin/
 RUN set -ex \
- && apt-get update && apt-get install -y make curl git \
- && curl -sSL https://download.docker.com/linux/static/stable/x86_64/docker-${DOCKER_VERSION}.tgz | tar -xz -C /usr/local/bin --strip-components=1 \
- && chmod +x /usr/local/bin/inner-runner
+ && /usr/local/bin/build.sh
 
 ENTRYPOINT ["/usr/local/bin/inner-runner"]

build.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+set -euxo pipefail
+
+export DEBIAN_FRONTEND=noninteractive
+
+# Install required utils
+apt-get update
+apt-get install -y --no-install-recommends \
+  apt-transport-https \
+  ca-certificates \
+  curl \
+  dirmngr \
+  git \
+  gnupg \
+  jq \
+  lsb-release \
+  make
+
+# Download latest release of inner-runner
+DOWNLOAD=$(curl -sSfL https://api.github.com/repos/repo-runner/repo-runner/releases/latest |
+	jq -r '.assets | .[] | select(.name == "inner-runner_linux_amd64.tar.gz") | .browser_download_url')
+curl -sSfL "${DOWNLOAD}" | tar -xzf - -C /usr/local/bin
+mv /usr/local/bin/inner-runner* /usr/local/bin/inner-runner
+
+# Install docker-ce
+apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 9DC858229FC7DD38854AE2D88D81803C0EBFCD88
+
+echo "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -sc) stable" >/etc/apt/sources.list.d/docker.list
+apt-get update
+apt-get install -y --no-install-recommends docker-ce
+
+# Cleanup
+apt-get purge -y \
+  dirmngr \
+  gnupg \
+  jq \
+  lsb-release
+apt-get autoremove --purge -y
+rm -rf /var/lib/apt/lists/*