Add Dockerfile and build script for multi-arch build

Dockerfile

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+FROM alpine:latest
+
+# Install jq, curl and ca-certificates
+RUN apk add --no-cache jq curl ca-certificates bash tar
+
+# Create a directory for speedtest
+WORKDIR /app
+
+# Download the appropriate speedtest binary based on architecture
+ARG TARGETARCH
+# Download the appropriate speedtest binary based on architecture
+RUN set -ex; \
+    if [ "$TARGETARCH" = "amd64" ]; then \
+        ARCH="x86_64"; \
+    elif [ "$TARGETARCH" = "arm64" ]; then \
+        ARCH="aarch64"; \
+    elif [ "$TARGETARCH" = "arm" ]; then \
+        ARCH="armhf"; \
+    else \
+        echo "Unsupported architecture: $TARGETARCH" && exit 1; \
+    fi; \
+    URL="https://install.speedtest.net/app/cli/ookla-speedtest-1.2.0-linux-${ARCH}.tgz"; \
+    echo "Downloading speedtest from: $URL"; \
+    curl -sSLo speedtest.tgz "$URL"; \
+    tar zxvf speedtest.tgz speedtest; \
+    rm speedtest.tgz; \
+    mv speedtest /usr/local/bin/; \
+    chmod +x /usr/local/bin/speedtest
+
+# Copy the script
+COPY send-speedtest.sh /usr/local/bin/send-speedtest.sh
+RUN chmod +x /usr/local/bin/send-speedtest.sh
+
+# Run the script by default
+ENTRYPOINT ["/usr/local/bin/send-speedtest.sh"]

build-and-push.sh

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+#!/bin/bash
+
+set -e
+
+# Default to "latest" if no tag is provided
+TAG=${1:-latest}
+IMAGE_NAME="gitea.oncloud.my.id/wartana/speedtest-ookla"
+FULL_IMAGE_NAME="${IMAGE_NAME}:${TAG}"
+
+echo "Building and pushing multi-architecture image: $FULL_IMAGE_NAME"
+
+# Ensure buildx is set up and create a new builder instance if one doesn't exist
+if ! docker buildx ls | grep -q 'speedtest-builder'; then
+    echo "Creating new buildx builder instance..."
+    docker buildx create --name speedtest-builder --use
+else
+    echo "Using existing buildx builder instance..."
+    docker buildx use speedtest-builder
+fi
+
+# Boot up the builder
+docker buildx inspect --bootstrap
+
+# Build and push the image for amd64, arm64, and arm/v7 (arm32)
+docker buildx build \
+  --platform linux/amd64,linux/arm64,linux/arm/v7 \
+  -t "$FULL_IMAGE_NAME" \
+  --push \
+  .
+
+echo "Successfully built and pushed $FULL_IMAGE_NAME"