add docker build

.github/workflows/build.yaml

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+name: Github Actions Demo
+run-name: ${{ github.actor }} is testing out GitHub Actions (on Gitea) 🚀
+on: [push]
+
+jobs:
+  Explore-Gitea-Actions:
+    runs-on: metal-docker
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v3
+      - run: |
+          env
+          docker build --progress plain --iidfile iid.txt .
+          stringprefix() { [ ${#1} -le $2 ] && echo $1 && return 0 || stringprefix "${1%?}" $2 ; }
+          SHORTSHA="$(stringprefix "$GITHUB_SHA" 8)"
+          for TAG in "$SHORTSHA" "$GITHUB_REF_NAME";do
+            docker tag "`cat iid.txt`" "$DOCKER_REGISTRY/$GITHUB_REPOSITORY:$TAG"
+            docker push "$DOCKER_REGISTRY/$GITHUB_REPOSITORY:$TAG"
+          done

Dockerfile

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+FROM golang:1.21 AS build
+
+WORKDIR /ipfs-key
+ADD go.mod go.sum /ipfs-key
+RUN echo 'package main;func main() {}' > main.go
+RUN go get && rm main.go
+
+ADD main.go /ipfs-key
+RUN go build
+
+FROM scratch
+
+COPY --from=build /ipfs-key/ipfs-key /ipfs-key
+
+ENTRYPOINT /ipfs-key