fixes #3: dockerize app

Author: Mario Luan Santos de Souza

.env

@@ -0,0 +1 @@
+APP_PATH=/home/gradle/java-sorting-algorithms

Dockerfile

@@ -0,0 +1,7 @@
+FROM gradle:4.5.0-jdk8-alpine
+
+ENV USER gradle
+ENV APP_PATH /home/gradle/java-sorting-algorithms
+
+RUN mkdir $APP_PATH \
+  && chown $USER $APP_PATH

README-docker.md

@@ -0,0 +1,15 @@
+# README-docker.md
+
+**Pre-requisites:**
+- docker (17.12.0-ce)
+- docker-compose (1.18.0)
+
+## Test
+```bash
+docker-compose run gradle gradle clean cobertura check
+```
+
+## Build
+```bash
+docker-compose run gradle gradle clean assemble
+```

README.md

@@ -17,7 +17,7 @@ Import the files [code-style.xml](code-style.xml) and [formatter.xml](formatter.
 
 ## Test
 ```bash
-gradle clean coberturaCheck check
+gradle clean cobertura check
 # Test summary will be located at `build/reports/tests/test/index.html`
 # Coverage report will be located at `build/reports/cobertura/index.html`.
 # Code style issues report will be located at `build/reports/checkstyle/main.html`

docker-compose.yml

@@ -0,0 +1,14 @@
+version: '3'
+services:
+  gradle:
+    build: .
+    working_dir: $APP_PATH
+    volumes:
+      - ./config:$APP_PATH/config
+      - ./src:$APP_PATH/src
+      - ./build.gradle:$APP_PATH/build.gradle
+      - ./settings.gradle:$APP_PATH/settings.gradle
+      - gradle_cache:/home/gradle/.gradle
+    command: gradle --help
+volumes:
+  gradle_cache: