Fixing Maven Cache issues on Dockerfile build

Author: luismr

.gitignore

@@ -33,3 +33,5 @@ build/
 .vscode/ 
 
 .env
+
+.cache/.m2/repository

Dockerfile

@@ -13,7 +13,13 @@ COPY .mvn .mvn
 COPY pom.xml .
 COPY src ./src
 
-RUN mvn clean install -DskipTests --settings .mvn/settings.xml
+# Install dependencies first (this layer will be cached)
+RUN --mount=type=cache,target=/root/.m2 \
+    mvn dependency:go-offline --settings .mvn/settings.xml
+
+# Build the application
+RUN --mount=type=cache,target=/root/.m2 \
+    mvn clean install -DskipTests --settings .mvn/settings.xml
 
 # Run stage
 FROM eclipse-temurin:21-jre-jammy