Use lighter docker images (Alpine < Debian)

tests/go/Dockerfile

@@ -1,7 +1,8 @@
-FROM golang:1
+FROM golang:1-alpine
 
+RUN apk add git
 RUN go get golang.org/x/tools/cmd/goimports
 RUN go get github.com/01-edu/z01
 RUN go get github.com/01-edu/public/rc
 COPY . /app
-ENTRYPOINT ["/bin/bash", "/app/entrypoint.sh"]
+ENTRYPOINT ["/bin/sh", "/app/entrypoint.sh"]

tests/sh/Dockerfile

@@ -1,6 +1,5 @@
-FROM debian
+FROM alpine
 
-RUN apt-get update
+RUN apk add jq curl git
-RUN apt-get install -y jq curl git
 COPY . /app
-ENTRYPOINT ["/bin/bash", "/app/entrypoint.sh"]
+ENTRYPOINT ["/bin/sh", "/app/entrypoint.sh"]

tests/sh/entrypoint.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 
-# Unofficial Bash Strict Mode
+set -o errexit
-set -euo pipefail
+set -o pipefail
 IFS='
 '
 
@@ -11,5 +11,5 @@ if ! test -f ${EXERCISE}_test.sh; then
 	echo No test file found for the exercise : "$EXERCISE"
 	exit 1
 fi
-bash ${EXERCISE}_test.sh
+sh ${EXERCISE}_test.sh
 echo PASS