Add Dockerfile and instructions

Dockerfile

@@ -0,0 +1,18 @@
+FROM golang:1.21.4 AS Build
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY *.go ./
+COPY cmd ./cmd
+COPY pkg ./pkg
+RUN CGO_ENABLED=0 GOOS=linux go build -o /gpodder2go
+
+FROM alpine:3.18.4
+RUN mkdir /data
+WORKDIR /data
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /data
+COPY --from=Build /gpodder2go /gpodder2go
+EXPOSE 3005
+VOLUME /data
+CMD ["/entrypoint.sh"]

README.md

@@ -85,3 +85,31 @@ Add with:
 ```
 # eselect repository add seiga git https://github.com/seigakaku/gentoo_ebuilds
 ```
+
+### Docker
+
+Build with:
+
+```
+$ git clone https://github.com/oxtyped/gpodder2go
+$ cd gpodder2go
+$ docker build -t oxtyped/gpodder2go .
+```
+
+Run with:
+
+```
+$ docker run --rm -it -p 3005:3005 oxtyped/gpodder2go
+```
+
+For persistent data, you can map `/data` as a volume:
+
+```
+$ docker run --rm -it -v /gpodder2go_data:/data -p 3005:3005 oxtyped/gpodder2go
+```
+
+To add a user:
+
+```
+$ docker run --rm -it -v /gpodder2go_data:/data oxtyped/gpodder2go /gpodder2go accounts create <username> --email="<email>" --name="<display_name>" --password="<password>"
+```

entrypoint.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+if [ ! -f "/data/g2g.db" ]; then
+    echo "No database found, intializing gpodder2go ..."
+    /gpodder2go init
+    echo "... database initialized"
+fi
+if [ ! -f "/data/VERIFIER_SECRET_KEY" ]; then
+    echo "VERIFIER_SECRET_KEY not found, intializing VERIFIER_SECRET_KEY ..."
+    cat /dev/urandom  | head -c 30 | base64 > /data/VERIFIER_SECRET_KEY
+    echo "... VERIFIER_SECRET_KEY initialized"
+fi
+VERIFIER_SECRET_KEY="$(cat /data/VERIFIER_SECRET_KEY)" /gpodder2go serve --addr "${ADDR:-0.0.0.0:3005}"