Multi-arch builds (#32)

* feat: enable multi-arch builds and add tor and i2p images

This commit introduces multi-architecture support (amd64 & arm64)
for Docker image builds using Docker Buildx. It also adds new
images for tor and i2p services. The release script is updated to
handle these new images and to accept a Docker Hub username as an
argument. The publish workflow is updated to use the new release
script and to set up QEMU and Docker Buildx.

* feat(publish.yaml): add workflow_dispatch trigger to publish workflow
feat(publish.yaml): allow publish workflow to run when workflow_dispatch event is triggered

* feat(dockerfiles/monero): add support for ARM64 architecture

* build(dockerfiles/monero): remove duplicate FROM instruction

release(monero)

dockerfiles/i2p

@@ -1,12 +1,23 @@
 FROM ubuntu:22.04
 
-ENV DEBIAN_FRONTEND noninteractive
+ENV DEBIAN_FRONTEND=noninteractive
 
-RUN apt-get update && \
-    apt-get install wget sudo -y
-RUN wget https://github.com/PurpleI2P/i2pd/releases/download/2.54.0/i2pd_2.54.0-1jammy1_amd64.deb -O i2pd.deb -q
-RUN apt install ./i2pd.deb -y
-RUN rm -rf i2p.deb && \
+RUN apt-get update && apt-get install -y wget sudo
+
+# Detect architecture and use it immediately to download and install the corresponding i2pd package.
+RUN set -ex; \
+    arch=$(uname -m); \
+    if [ "$arch" = "x86_64" ]; then \
+         ARCH="amd64"; \
+    elif [ "$arch" = "aarch64" ]; then \
+         ARCH="arm64"; \
+    else \
+         echo "Unsupported architecture: $arch" && exit 1; \
+    fi; \
+    echo "Using architecture: $ARCH"; \
+    wget "https://github.com/PurpleI2P/i2pd/releases/download/2.54.0/i2pd_2.54.0-1jammy1_${ARCH}.deb" -O i2pd.deb -q && \
+    apt install ./i2pd.deb -y && \
+    rm -rf i2pd.deb && \
     apt clean all && \
     apt autoremove -y