ci: build serveur API depuis les sources + déploiement registry (prod/preprod)

Dockerfile multi-stage (SDK 8 publish → aspnet 8) et workflow Gitea Actions :
main → :latest (prod), preprod → :preprod. Base = tag b8 (état déployé).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -0,0 +1,33 @@
+name: Build & Deploy
+
+on:
+  push:
+    branches: [main, preprod]
+  workflow_dispatch: {}
+
+env:
+  IMAGE: git.nfteam.ovh/neckfire/the-cycle
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Build & push image
+        run: |
+          set -e
+          echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login git.nfteam.ovh -u "${{ secrets.REGISTRY_USER }}" --password-stdin
+          SHA="${GITHUB_SHA::12}"
+          BRANCH="${GITHUB_REF_NAME}"
+          if [ "$BRANCH" = "main" ]; then TAGS="-t ${IMAGE}:latest -t ${IMAGE}:${SHA}"; else TAGS="-t ${IMAGE}:${BRANCH} -t ${IMAGE}:${BRANCH}-${SHA}"; fi
+          docker build $TAGS -f Dockerfile .
+          docker push --all-tags "${IMAGE}"
+      - name: Notify ntfy
+        if: always()
+        run: |
+          if [ "${{ job.status }}" = "success" ]; then EMOJI="white_check_mark"; PRIO="default"; else EMOJI="rotating_light"; PRIO="high"; fi
+          curl -s -H "Authorization: Bearer ${{ secrets.NTFY_TOKEN }}" -H "Title: ${GITHUB_REPOSITORY} — ${{ job.status }}" \
+            -H "Priority: ${PRIO}" -H "Tags: ${EMOJI}" -H "Click: ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions" \
+            -d "${GITHUB_WORKFLOW} (${GITHUB_REF_NAME} #${GITHUB_RUN_NUMBER}) : ${{ job.status }}" \
+            "${{ secrets.NTFY_URL }}/${{ secrets.NTFY_TOPIC }}" || true