add github action, build script, docker ignore

.dockerignore

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+.env
+.git

.gitea/workflows/build.yaml

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+name: Build
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: linux-arm64
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Login to Gitea Registry
+        uses: docker/login-action@v3
+        with:
+          registry: gitea.coupxd.com
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build and Push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          platforms: linux/arm64
+          push: true
+          tags: gitea.coupxd.com/cody/go-weather:latest

Dockerfile

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+FROM golang:1.23-bookworm AS builder
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+# Buildx automatically injects TARGETARCH, TARGETOS, and TARGETPLATFORM as build args into the Dockerfile
+ARG TARGETARCH
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=${TARGETARCH} go build -o go-weather .
+FROM gcr.io/distroless/static-debian12
+COPY --from=builder /app/go-weather /go-weather
+EXPOSE 8080
+ENTRYPOINT ["/go-weather"]

build.sh

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+#!/bin/bash
+
+echo "Creating build environment"
+docker buildx create --name pibuilder --use
+
+echo "Printing build environment info"
+docker buildx inspect --bootstrap
+
+echo "Doing build"
+docker buildx build \
+    --platform linux/arm64 \
+    --push \
+    -t gitea.coupxd.com/cody/hello-fastapi:latest \
+    .
+