add docker tasks

docker/Dockerfile

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+FROM golang:1.24 AS build_image
+
+WORKDIR /usr/src/app
+
+# pre-copy/cache go.mod for pre-downloading dependencies and only redownloading them in subsequent builds if they change
+COPY go.mod go.sum ./
+RUN go mod download && go mod verify
+
+COPY . .
+
+# build binary, place into ./bin/
+RUN CGO_ENABLED=0 GOOS=linux go build -o ./bin/q3rcon-proxy ./cmd/q3rcon-proxy/
+
+FROM scratch AS final_image
+
+WORKDIR /bin/
+
+COPY --from=build_image /usr/src/app/bin/q3rcon-proxy .
+
+# Command to run when starting the container
+ENTRYPOINT [ "./q3rcon-proxy" ]

docker/Taskfile.docker.yml

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+version: '3'
+
+tasks:
+  build:
+    desc: Build the Docker image
+    cmds:
+      - docker build -t q3rcon-proxy -f docker/Dockerfile .
+    dir: .
+
+  login:
+    desc: Login to Github Container Registry
+    cmds:
+      - docker login ghcr.io -u onyx-and-iris --password-stdin <<< {{.GHCR_TOKEN}}
+    internal: true
+
+  push:
+    desc: Push the Docker image to Github Container Registry
+    deps:
+      - task: build
+      - task: login
+    cmds:
+      - docker tag q3rcon-proxy ghcr.io/onyx-and-iris/q3rcon-proxy:latest
+      - docker push ghcr.io/onyx-and-iris/q3rcon-proxy:latest