refactor: Move supautils download script to external file

Dockerfile

@@ -847,26 +847,16 @@ ARG supautils_release_amd64_deb_checksum
 
 RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*
 
-# Set up a script to download the correct package
-RUN echo '#!/bin/sh' > /tmp/download_supautils.sh && \
-    echo 'set -e' >> /tmp/download_supautils.sh && \
-    echo 'if [ "$TARGETARCH" = "amd64" ]; then' >> /tmp/download_supautils.sh && \
-    echo '    CHECKSUM="${supautils_release_amd64_deb_checksum}"' >> /tmp/download_supautils.sh && \
-    echo '    ARCH="amd64"' >> /tmp/download_supautils.sh && \
-    echo 'elif [ "$TARGETARCH" = "arm64" ]; then' >> /tmp/download_supautils.sh && \
-    echo '    CHECKSUM="${supautils_release_arm64_deb_checksum}"' >> /tmp/download_supautils.sh && \
-    echo '    ARCH="arm64"' >> /tmp/download_supautils.sh && \
-    echo 'else' >> /tmp/download_supautils.sh && \
-    echo '    echo "Unsupported architecture: $TARGETARCH" >&2' >> /tmp/download_supautils.sh && \
-    echo '    exit 1' >> /tmp/download_supautils.sh && \
-    echo 'fi' >> /tmp/download_supautils.sh && \
-    echo 'CHECKSUM=$(echo $CHECKSUM | sed "s/^sha256://")' >> /tmp/download_supautils.sh && \
-    echo 'curl -fsSL -o /tmp/supautils.deb \\' >> /tmp/download_supautils.sh && \
-    echo '    "https://github.com/supabase/supautils/releases/download/v${supautils_release}/supautils-v${supautils_release}-pg${postgresql_major}-$ARCH-linux-gnu.deb"' >> /tmp/download_supautils.sh && \
-    echo 'echo "$CHECKSUM  /tmp/supautils.deb" | sha256sum -c -' >> /tmp/download_supautils.sh && \
-    chmod +x /tmp/download_supautils.sh
+# Add the external download script
+ADD scripts/download_supautils.sh /tmp/download_supautils.sh
 
 # Run the script to download and verify the package
+ARG supautils_release_arm64_deb_checksum
+ARG supautils_release_amd64_deb_checksum
+ENV supautils_release=${supautils_release} \
+    postgresql_major=${postgresql_major} \
+    supautils_release_arm64_deb_checksum=${supautils_release_arm64_deb_checksum} \
+    supautils_release_amd64_deb_checksum=${supautils_release_amd64_deb_checksum}
 RUN /tmp/download_supautils.sh && rm /tmp/download_supautils.sh
 
 ####################

scripts/download_supautils.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+set -e
+# Ensure mandatory environment variables are set
+: "${supautils_release:?Environment variable supautils_release is required}"
+: "${postgresql_major:?Environment variable postgresql_major is required}"
+: "${supautils_release_arm64_deb_checksum:?Environment variable supautils_release_arm64_deb_checksum is required}"
+: "${supautils_release_amd64_deb_checksum:?Environment variable supautils_release_amd64_deb_checksum is required}"
+
+# Fallback to uname -m if TARGETARCH is not set
+TARGETARCH=${TARGETARCH:-$(uname -m)}
+
+if [ "$TARGETARCH" = "amd64" ]; then
+    CHECKSUM="${supautils_release_amd64_deb_checksum}"
+    ARCH="amd64"
+elif [ "$TARGETARCH" = "arm64" ]; then
+    CHECKSUM="${supautils_release_arm64_deb_checksum}"
+    ARCH="arm64"
+else
+    echo "Unsupported architecture: $TARGETARCH" >&2
+    exit 1
+fi
+CHECKSUM=$(echo $CHECKSUM | sed "s/^sha256://")
+curl -fsSL -o /tmp/supautils.deb \
+    "https://github.com/supabase/supautils/releases/download/v${supautils_release}/supautils-v${supautils_release}-pg${postgresql_major}-$ARCH-linux-gnu.deb"
+CHECKSUM_LINE=$(echo "$CHECKSUM  /tmp/supautils.deb")
+echo "$CHECKSUM_LINE" | sha256sum -c -