added support for arm v7,arm64(v8)

.github/workflows/docker.yml

@@ -28,9 +28,11 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           push: true
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           tags: geti2p/i2p:${{ env.RELEASE_VERSION }}
       - name: Build and push
         uses: docker/build-push-action@v6
         with:
           push: true
-          tags: geti2p/i2p.i2p:${{ env.RELEASE_VERSION }}
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
+          tags: geti2p/i2p.i2p:${{ env.RELEASE_VERSION }}

.github/workflows/ghcr.yml

@@ -28,6 +28,10 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
       # Uses the `docker/login-action` action to log in to the Container registry registry using the account and password that will publish the packages. Once published, the packages are scoped to the account defined here.
       - name: Log in to the Container registry
         uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
@@ -50,6 +54,7 @@ jobs:
         with:
           context: .
           push: true
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
       
@@ -60,4 +65,4 @@ jobs:
           subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}
           subject-digest: ${{ steps.push.outputs.digest }}
           push-to-registry: true
-      
+      

Dockerfile

@@ -1,4 +1,8 @@
-FROM alpine:latest as builder
+ARG TARGETARCH
+
+# --- Single builder (Java bytecode is platform-independent) ---
+
+FROM --platform=linux/amd64 alpine:latest AS builder
 
 ENV APP_HOME="/i2p"
 ARG ANT_VERSION="1.10.15"
@@ -12,10 +16,22 @@ RUN apk add --no-cache gettext tar bzip2 curl openjdk21 \
     && /opt/apache-ant-${ANT_VERSION}/bin/ant preppkg-linux-only \
     && rm -rf pkg-temp/osid pkg-temp/lib/wrapper pkg-temp/lib/wrapper.*
 
-FROM alpine:latest
-ENV APP_HOME="/i2p"
-RUN apk add openjdk21
+# --- Runtime stages per architecture ---
 
+FROM alpine:latest AS runtime-amd64
+RUN apk add --no-cache openjdk21
+
+FROM alpine:latest AS runtime-arm64
+RUN apk add --no-cache openjdk21
+
+FROM debian:bookworm-slim AS runtime-arm
+RUN apt-get update && apt-get install -y --no-install-recommends openjdk-17-jre-headless \
+    && apt-get clean && rm -rf /var/lib/apt/lists/*
+
+# Select runtime based on target architecture
+FROM runtime-${TARGETARCH}
+
+ENV APP_HOME="/i2p"
 WORKDIR ${APP_HOME}
 COPY --from=builder /tmp/build/pkg-temp .
 
@@ -37,4 +53,4 @@ LABEL \
       org.label-schema.vcs-url="https://github.com/i2p/i2p.i2p" \
       org.label-schema.schema-version="1.0"
 
-ENTRYPOINT ["/startapp.sh"]
+ENTRYPOINT ["/startapp.sh"]