add docker image and workflow

.github/workflows/publish.yaml

@@ -0,0 +1,48 @@
+#
+name: Create and publish a Docker image
+
+# Configures this workflow to run every time a change is pushed to the branch called `main`.
+on:
+  push:
+    branches: ['main']
+
+# Defines two custom environment variables for the workflow. These are used for the Container registry domain, and a name for the Docker image that this workflow builds.
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+# There is a single job in this workflow. It's configured to run on the latest available version of Ubuntu.
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    # Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
+    permissions:
+      contents: read
+      packages: write
+      # 
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      # Uses the `docker/login-action` action to log in to the Container registry registry using the account and password that will publish the packages. Once published, the packages are scoped to the account defined here.
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      # This step uses [docker/metadata-action](https://github.com/docker/metadata-action#about) to extract tags and labels that will be applied to the specified image. The `id` "meta" allows the output of this step to be referenced in a subsequent step. The `images` value provides the base name for the tags and labels.
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+      # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
+      # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.
+      # It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.
+      - name: Build and push Docker image
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -0,0 +1,29 @@
+# syntax=docker/dockerfile:1
+
+FROM golang:alpine AS builder
+
+WORKDIR /build
+
+# Download Go modules
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Transfer source code
+COPY templates ./templates
+COPY *.go ./
+
+# Build
+RUN CGO_ENABLED=0 go build -trimpath -o /dist/app
+
+# Test
+FROM build-stage AS run-test-stage
+RUN go test -v ./...
+
+FROM scratch AS build-release-stage
+
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=builder /dist /app
+
+WORKDIR /app
+
+ENTRYPOINT ["/app/app"]

docker-compose.yaml

@@ -0,0 +1,13 @@
+version: '3.8'
+
+services:
+  app:
+    build: .
+    image: ghcr.io/birabittoh/nds-converter:main
+    container_name: nds-converter
+    restart: unless-stopped
+    ports:
+      - 3000:3000
+    environment:
+      - PORT=3000
+      - MAX_SIZE_MB

nds-converter.go

@@ -30,6 +30,7 @@ func main() {
 	if err != nil {
 		MaxFileSize = DefaultMaxFileSize
 	}
+	println("Max file size:", MaxFileSize, "MB.")
 	MaxFileSize *= MB
 
 	AdditionalBytes, _ = hex.DecodeString(AdditionalBytesHex)