ci: Add a woodpecker workflow to publish a nightly amd64 version

.woodpecker/publish.yaml

@@ -0,0 +1,21 @@
+when:
+  event: [push, cron, pull_request, manual]
+
+steps:
+  - name: Build Nightly Artifact
+    image: ocaml/opam:debian-11-ocaml-5.1
+    commands:
+      - opam install . --deps-only
+      - opam exec -- dune build
+      - mkdir -p dist
+      - opam exec -- dune install --prefix=$(pwd)/dist
+
+      - tar czvf ollisp-nightly.tar.gz -C dist .
+  - name: Publish to Gitea
+    image: curlimages/curl
+    environment:
+      GITEA_TOKEN:
+        from_secret: package_token
+    commands:
+      - curl -v --user "$CI_REPO_OWNER:$GITEA_TOKEN" --upload-file my-lang-nightly-linux-amd64.tar.gz $CI_FORGE_URL/api/packages/$CI_REPO_OWNER/generic/olisp/nightly/ollisp-nightly-amd64.tar.gz?duplicate_upgrade=true
+