Use TARGETARCH and TARGETOS to fetch the correct Go binary for multi-…

…arch builds.

Signed-off-by: Rafael Zago <[email protected]>

Dockerfile

@@ -1,35 +1,43 @@
 FROM alpine:latest
 
-# Install base tools without tshark
+# Install base tools
 RUN apk update && apk add --no-cache \
- bash \
- curl \
- wget \
- tar \
- traceroute \
- openssl \
- iperf3 \
- busybox-extras \
- nmap \
- netcat-openbsd \
- tcpdump \
- mtr \
- socat \
- bind-tools \
- iproute2 \
- openssh-client \
- python3 \
- procps \
- coreutils \
- mongodb-tools \
- postgresql15-client \
- py3-flask
-
-# Install Go 1.22.8 manually to /usr/local/go
+  bash \
+  curl \
+  wget \
+  tar \
+  traceroute \
+  openssl \
+  iperf3 \
+  busybox-extras \
+  nmap \
+  netcat-openbsd \
+  tcpdump \
+  mtr \
+  socat \
+  bind-tools \
+  iproute2 \
+  openssh-client \
+  python3 \
+  procps \
+  coreutils \
+  mongodb-tools \
+  postgresql15-client \
+  py3-flask
+
+# Set up build arguments (provided by buildx)
+ARG TARGETOS
+ARG TARGETARCH
+
+# Set Go version
 ENV GO_VERSION=1.22.8
-RUN wget https://dl.google.com/go/go$GO_VERSION.linux-amd64.tar.gz && \
- tar -C /usr/local -xzf go$GO_VERSION.linux-amd64.tar.gz && \
- rm go$GO_VERSION.linux-amd64.tar.gz
+# Compose the correct URL for the architecture
+ENV GO_URL=https://dl.google.com/go/go${GO_VERSION}.${TARGETOS}-${TARGETARCH}.tar.gz
+
+# Download and install Go based on target architecture
+RUN wget -O go.tar.gz $GO_URL && \
+    tar -C /usr/local -xzf go.tar.gz && \
+    rm go.tar.gz
 
 # Set Go path
 ENV PATH="/usr/local/go/bin:${PATH}"
@@ -40,8 +48,9 @@ RUN go version
 # Copy the Flask app
 COPY app.py /app.py
 
-# Expose port 5000 for the app.py
+# Expose port 5000
 EXPOSE 5000
 
 # Run the Flask app
 CMD ["python3", "/app.py"]
+