ci: 👷 add dockerfile and drone build pipeline

.dockerignore

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+src/wasm_exec.js
+public/main.wasm

.drone.yml

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+kind: pipeline
+type: kubernetes
+name: publish Docker image on main
+steps:
+  - image: plugins/docker
+    name: publish Docker image
+    settings:
+      auto_tag: true
+      cache_from:
+        - gitea.dikurium.ch/Freund_und_Partner/customer-files-organizer-web:latest
+      registry: gitea.dikurium.ch
+      repo: gitea.dikurium.ch/Freund_und_Partner/customer-files-organizer-web
+      username:
+        from_secret: git_user
+      password:
+        from_secret: git_pass
+trigger:
+  branch:
+    - main
+  event:
+    - push

Dockerfile

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+FROM golang:1.24-alpine AS wasm_builder
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY main.go ./
+RUN GOOS="js" GOARCH="wasm" go build -o main.wasm
+
+RUN cp "$(go env GOROOT)/lib/wasm/wasm_exec.js" ./
+
+FROM node:22-alpine AS deps
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci
+
+FROM node:22-alpine AS builder
+
+WORKDIR /app
+
+COPY --from=wasm_builder /app/main.wasm ./public/main.wasm
+COPY --from=wasm_builder /app/wasm_exec.js ./src/wasm_exec.js
+COPY --from=deps /app/node_modules ./node_modules
+
+COPY . .
+
+RUN npm run build
+
+FROM node:22-alpine
+
+WORKDIR /app
+
+COPY --from=builder /app/dist ./dist
+
+RUN npm i -g serve
+
+EXPOSE 3000
+
+CMD [ "serve", "-s", "dist" ]