Add dockerfile, update ping route to alive route, add documentation

Dockerfile

@@ -0,0 +1,21 @@
+# syntax=docker/dockerfile:1
+FROM docker.io/golang:1.23
+
+# Create working directory and grab deps
+WORKDIR /usr/src/gomusic
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy the source code. Note the slash at the end, as explained in
+# https://docs.docker.com/engine/reference/builder/#copy
+COPY *.go ./
+
+# Build
+# Note that our dependencies require CGO
+RUN CGO_ENABLED=1 GOOS=linux go build -v -o /usr/local/bin/gomusic
+
+# Signal which ports we use
+EXPOSE 8000
+
+# Run
+CMD ["gomusic"]