docker-compose.yml

version: '3.8'
services:
  app:
    build:
      context: .

Dockerfile

FROM alpine:3.12.0

RUN mkdir /app
COPY print.sh /app
ENV PATH /app:$PATH

ENTRYPOINT ["print.sh"]

print.sh

#!/bin/sh

echo "Hello, ${@}!"

run.sh

#!/bin/sh

echo '--- docker build ---'
docker build -t can-i-use-cache:latest .
# --- docker build ---
# Sending build context to Docker daemon   5.12kB
# Step 1/5 : FROM alpine:3.12.0
#  ---> a24bb4013296
# Step 2/5 : RUN mkdir /app
#  ---> Running in c1f982e10c52
# Removing intermediate container c1f982e10c52
#  ---> 2fe579ed6f0f
# Step 3/5 : COPY print.sh /app
#  ---> b79d2046076a
# Step 4/5 : ENV PATH /app:$PATH
#  ---> Running in 986c29c55213
# Removing intermediate container 986c29c55213
#  ---> ad9ff528f463
# Step 5/5 : ENTRYPOINT ["print.sh"]
#  ---> Running in 263b7aed0711
# Removing intermediate container 263b7aed0711
#  ---> cf15b116dd1c
# Successfully built cf15b116dd1c
# Successfully tagged can-i-use-cache:latest

echo '--- docker-compose build ---'
docker-compose build
# --- docker-compose build ---
# Building app
# Step 1/5 : FROM alpine:3.12.0
#  ---> a24bb4013296
# Step 2/5 : RUN mkdir /app
#  ---> Using cache
#  ---> 2fe579ed6f0f
# Step 3/5 : COPY print.sh /app
#  ---> a787e9b6de30
# Step 4/5 : ENV PATH /app:$PATH
#  ---> Running in 3d069fd24b3e
# Removing intermediate container 3d069fd24b3e
#  ---> 99848159747d
# Step 5/5 : ENTRYPOINT ["print.sh"]
#  ---> Running in e963aa1251e0
# Removing intermediate container e963aa1251e0
#  ---> 2fb18b36813a
#
# Successfully built 2fb18b36813a
# Successfully tagged 20200817plqosg_app:latest