chore(docker): Move build logic to script file

docker/Dockerfile

@@ -6,29 +6,10 @@ ARG RELEASE_TAG=latest
 ARG TARGETPLATFORM
 ARG REPOSITORY=recyclarr/recyclarr
 
-RUN apk add unzip
+COPY --chmod=544 ./build.sh .
 
-RUN set -ex; \
+RUN apk add unzip
-    \
+RUN ./build.sh
-    # The download path is a bit different when using the latest release instead of a specific
-    # release
-    if [ "$RELEASE_TAG" = "latest" ]; then \
-        download_path="latest/download"; \
-    else \
-        download_path="download/$RELEASE_TAG"; \
-    fi; \
-    \
-    # Determine the runtime from the target platform provided by Docker Buildx
-    case "$TARGETPLATFORM" in \
-        "linux/arm/v7") runtime="linux-musl-arm" ;; \
-        "linux/arm64") runtime="linux-musl-arm64" ;; \
-        "linux/amd64") runtime="linux-musl-x64" ;; \
-        *) echo >&2 "ERROR: Unsupported target platform: $TARGETPLATFORM"; exit 1 ;; \
-    esac; \
-    \
-    # Download and extract the recyclarr binary from the release
-    wget --quiet -O recyclarr.zip "https://github.com/$REPOSITORY/releases/$download_path/recyclarr-$runtime.zip"; \
-    unzip recyclarr.zip;
 
 #############################################################################
 FROM alpine

docker/build.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+set -ex
+
+# The download path is a bit different when using the latest release instead of a specific
+# release
+if [ "$RELEASE_TAG" = "latest" ]; then
+    download_path="latest/download";
+else
+    download_path="download/$RELEASE_TAG";
+fi
+
+# Determine the runtime from the target platform provided by Docker Buildx
+case "$TARGETPLATFORM" in
+    "linux/arm/v7") runtime="linux-musl-arm" ;;
+    "linux/arm64") runtime="linux-musl-arm64" ;;
+    "linux/amd64") runtime="linux-musl-x64" ;;
+    *) echo >&2 "ERROR: Unsupported target platform: $TARGETPLATFORM"; exit 1 ;;
+esac
+
+# Download and extract the recyclarr binary from the release
+wget --quiet -O recyclarr.zip "https://github.com/$REPOSITORY/releases/$download_path/recyclarr-$runtime.zip"
+unzip recyclarr.zip