Pass in config string rather than mounted file

Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-FROM --platform=${BUILDPLATFORM} golang:1.19-alpine3.15 AS builder
+FROM --platform=${BUILDPLATFORM} golang:1.23-alpine3.20 AS builder
 
 RUN apk add git
 
@@ -9,22 +9,29 @@ COPY . .
 
 ARG TARGETOS TARGETARCH TARGETVARIANT
 
+# Initialize go module if it doesn't exist
+RUN go mod init rtsp-to-web || true
+
 ENV CGO_ENABLED=0
-RUN go get \
+RUN go mod tidy \
     && go mod download \
     && GOOS=${TARGETOS} GOARCH=${TARGETARCH} GOARM=${TARGETVARIANT#"v"} go build -a -o rtsp-to-web
 
 FROM alpine:3.21
 
 WORKDIR /app
 
+RUN apk add --no-cache bash
+
 COPY --from=builder /go/src/app/rtsp-to-web /app/
 COPY --from=builder /go/src/app/web /app/web
+COPY docker-entrypoint.sh /app/
 
-RUN mkdir -p /config
-COPY --from=builder /go/src/app/config.json /config
+RUN mkdir -p /config && \
+    chmod +x /app/docker-entrypoint.sh
 
 ENV GO111MODULE="on"
 ENV GIN_MODE="release"
 
-CMD ["./rtsp-to-web", "--config=/config/config.json"]
+ENTRYPOINT ["/app/docker-entrypoint.sh"]
+CMD ["./rtsp-to-web", "--config=/config/config.json"]

docker-entrypoint.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+# Write the config string to the config file if CONFIG_STRING is provided
+if [ ! -z "$CONFIG_STRING" ]; then
+    echo "$CONFIG_STRING" > /config/config.json
+    echo "Config written to /config/config.json"
+fi
+
+# Execute the main command
+exec "$@"