Add Gitea CI/CD workflows and Dockerfile (#1)

Co-authored-by: Aneurin Barker Snook <aneurin@aneur.in>

.dockerignore

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+.git
+.gitea
+.gitignore
+Dockerfile
+.dockerignore
+README.md
+*.csv

.gitea/workflows/build.yml

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+name: Build
+
+# Builds the image on every push to main and pushes it to Gitea's container
+# registry as "latest" (after first re-tagging the current "latest" as
+# "previous", for a one-step-back rollback point -- no-ops on the very first
+# run, when there's no existing "latest" to promote). Deliberately just
+# "latest"/"previous", not per-commit tags, to avoid accumulating history.
+# See release.yml for tagged releases (git tag -> matching image tag).
+#
+# This project's CI/CD scope is intentionally just test/build/push --
+# deployment is being split into a separate project.
+#
+# Requires secrets.BUILD_API_TOKEN -- a personal access token
+# (write:package scope) from the pushing account, stored manually as a repo
+# secret. The auto-injected secrets.GITEA_TOKEN does NOT work for this: it
+# never grants package-registry access regardless of the workflow's own
+# `permissions:` block -- a known Gitea limitation, not a config mistake
+# (https://github.com/go-gitea/gitea/issues/23642).
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    # Relies on the Gitea runner's Docker daemon being reachable from job
+    # containers, which it is out of the box -- no extra runner config needed.
+    container:
+      image: docker:cli
+    steps:
+      # actions/checkout is a JS action; docker:cli is Alpine-based and has
+      # no node on PATH by default (same issue fixed in ci.yml).
+      - name: Install Node
+        run: apk add --no-cache nodejs
+
+      - uses: actions/checkout@v4
+
+      - name: Log in to the container registry
+        env:
+          BUILD_API_TOKEN: ${{ secrets.BUILD_API_TOKEN }}
+        run: echo "$BUILD_API_TOKEN" | docker login code.aneur.in -u "${{ gitea.actor }}" --password-stdin
+
+      - name: Promote the current "latest" to "previous"
+        run: |
+          IMAGE="code.aneur.in/${{ gitea.repository }}"
+          if docker pull "$IMAGE:latest"; then
+            docker tag "$IMAGE:latest" "$IMAGE:previous"
+            docker push "$IMAGE:previous"
+          fi
+
+      - name: Build and push "latest"
+        run: |
+          IMAGE="code.aneur.in/${{ gitea.repository }}:latest"
+          docker build -t "$IMAGE" .
+          docker push "$IMAGE"

.gitea/workflows/ci.yml

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+name: CI
+
+on:
+  pull_request:
+    branches: [main]
+
+jobs:
+  go-tests:
+    runs-on: ubuntu-latest
+    container: golang:1.25-alpine
+    steps:
+      # actions/checkout is a JS action -- golang:1.25-alpine has no node on
+      # PATH by default, so install it (musl-native, no glibc/Alpine mismatch)
+      # before any step that needs it.
+      - name: Install Node
+        run: apk add --no-cache nodejs
+
+      - uses: actions/checkout@v4
+
+      - name: Verify dependencies
+        run: go mod verify
+
+      - name: Vet
+        run: go vet ./...
+
+      - name: Build
+        run: go build ./...
+
+      - name: Test
+        run: go test ./...
+
+      - name: Audit dependencies
+        run: |
+          go install golang.org/x/vuln/cmd/govulncheck@latest
+          "$(go env GOPATH)/bin/govulncheck" ./...

.gitea/workflows/release.yml

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+name: Release
+
+# Builds and pushes an image tagged to match the git tag that triggered this
+# run -- e.g. pushing tag "v1.2.3" produces code.aneur.in/<owner>/<repo>:v1.2.3.
+# Separate from build.yml's "latest"/"previous" tracking on push to main.
+# This project's CI/CD scope is intentionally just test/build/push --
+# deployment (including how a given tag actually gets deployed) is being
+# split into a separate project.
+#
+# Assumes tags are cut from commits already on main (and so already covered
+# by ci.yml's checks) -- this workflow doesn't run the test suite itself.
+#
+# Requires secrets.BUILD_API_TOKEN -- a personal access token
+# (write:package scope) from the pushing account, stored manually as a repo
+# secret. The auto-injected secrets.GITEA_TOKEN does NOT work for this: it
+# never grants package-registry access regardless of the workflow's own
+# `permissions:` block -- a known Gitea limitation, not a config mistake
+# (https://github.com/go-gitea/gitea/issues/23642).
+
+on:
+  push:
+    tags: ['*']
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    # Relies on the Gitea runner's Docker daemon being reachable from job
+    # containers, which it is out of the box -- no extra runner config needed.
+    container:
+      image: docker:cli
+    steps:
+      # actions/checkout is a JS action; docker:cli is Alpine-based and has
+      # no node on PATH by default (same issue fixed in ci.yml).
+      - name: Install Node
+        run: apk add --no-cache nodejs
+
+      - uses: actions/checkout@v4
+
+      - name: Log in to the container registry
+        env:
+          BUILD_API_TOKEN: ${{ secrets.BUILD_API_TOKEN }}
+        run: echo "$BUILD_API_TOKEN" | docker login code.aneur.in -u "${{ gitea.actor }}" --password-stdin
+
+      - name: Build and push the image
+        run: |
+          IMAGE="code.aneur.in/${{ gitea.repository }}:${{ gitea.ref_name }}"
+          docker build -t "$IMAGE" .
+          docker push "$IMAGE"

Dockerfile

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+# Build stage: compile a static binary so the runtime image can be minimal.
+FROM golang:1.25-alpine AS build
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 go build -trimpath -o /ultrashorty .
+
+# Runtime stage.
+FROM alpine:3.20
+RUN adduser -D -u 10001 ultrashorty
+USER ultrashorty
+COPY --from=build /ultrashorty /usr/local/bin/ultrashorty
+# The redirects CSV is supplied at deploy time (bind mount / config), and
+# --host must be set to 0.0.0.0 to accept connections from outside the
+# container -- ultrashorty defaults to localhost. Example:
+#   docker run -v ./redirects.csv:/redirects.csv <image> --host 0.0.0.0 /redirects.csv
+EXPOSE 4000
+ENTRYPOINT ["ultrashorty"]