Merge pull request #16 from uherberg/uherberg-small-container

use small container

.github/workflows/docker-image.yml

@@ -3,8 +3,6 @@ name: Docker Image CI
 on:
   push:
     branches: [ "main" ]
-  pull_request:
-    branches: [ "main" ]
 
 jobs:
 

.github/workflows/pr.yml

@@ -0,0 +1,24 @@
+name: PR check
+
+on:
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up JDK 11
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.11
+    - name: Build with Maven
+      run:
+        mvn clean package --file pom.xml
+
+    - name: Build the Docker image
+      run: docker build . --file Dockerfile --tag ebay/digital-signature-verification-ebay-api:latest

Dockerfile

@@ -1,4 +1,34 @@
-FROM openjdk:11
+FROM azul/zulu-openjdk-alpine:11 as packager
+
+RUN { \
+        java --version ; \
+        echo "jlink version:" && \
+        jlink --version ; \
+    }
+
+ENV JAVA_MINIMAL=/opt/jre
+
+# build modules distribution
+RUN jlink \
+    --verbose \
+    --add-modules \
+        java.base,java.sql,java.naming,java.desktop,java.management,java.security.jgss,java.instrument \
+        # java.naming - javax/naming/NamingException
+        # java.desktop - java/beans/PropertyEditorSupport
+        # java.management - javax/management/MBeanServer
+        # java.security.jgss - org/ietf/jgss/GSSException
+        # java.instrument - java/lang/instrument/IllegalClassFormatException
+    --compress 2 \
+    --strip-debug \
+    --no-header-files \
+    --no-man-pages \
+    --output "$JAVA_MINIMAL"
+
+# Second stage, add only our minimal "JRE" distr and our app
+FROM alpine
+ENV JAVA_MINIMAL=/opt/jre
+ENV PATH="$PATH:$JAVA_MINIMAL/bin"
+COPY --from=packager "$JAVA_MINIMAL" "$JAVA_MINIMAL"
 WORKDIR /home/nouser/
 COPY src/main/resources/keys src/main/resources/keys
 COPY target/signaturevalidation*.jar .