Add Go exam image (run with arguments)

go/exam/Dockerfile

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+FROM golang:1-alpine
+
+ENV GIT_TERMINAL_PROMPT=0
+RUN apk add --no-cache 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/go/tests/rc
+COPY --from=mkcert-ca . /usr/local/share/ca-certificates
+RUN update-ca-certificates
+COPY entrypoint.sh /usr/local/bin
+ENTRYPOINT ["/bin/sh", "/usr/local/bin/entrypoint.sh"]

go/exam/entrypoint.sh

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+#!/bin/sh
+
+set -o noglob
+set -o errexit
+set -o nounset
+IFS='
+'
+
+mkdir -p src/student
+cd src/student
+
+first_file=$(echo "$EXPECTED_FILES" | cut -d' ' -f1)
+mkdir -p "$(dirname "$first_file")"
+cat > "$first_file"
+
+# Format code
+goimports -w .
+
+# Check restrictions
+if test "$ALLOWED_FUNCTIONS" && test "$EXPECTED_FILES"; then
+	IFS=' '
+	# shellcheck disable=SC2086
+	rc "$first_file" $ALLOWED_FUNCTIONS
+	IFS='
+'
+fi
+
+cd
+
+# Run program
+go build "./src/student/$EXERCISE"
+./"${EXERCISE}" "$@"