ci: remove Buildkite, add missing dependencies, README edits (#885)

* build: add libicu dependency for deb package

* ci: remove obsolete Buildkite publish workflow

* build: add xdg-utils dependency

* readme: update Linux notes

Remove Buildkite repo instructions and fix some typos.

.github/workflows/publish-packages.yml

@@ -1,39 +0,0 @@
-name: Publish to Buildkite
-on:
- workflow_call:
-   secrets:
-     BUILDKITE_TOKEN:
-       required: true
-jobs:
- publish:
-   name: Publish to Buildkite
-   runs-on: ubuntu-latest
-   strategy:
-     matrix:
-       runtime: [linux-x64, linux-arm64]
-   steps:
-     - name: Download package artifacts
-       uses: actions/download-artifact@v4
-       with:
-         name: package.${{ matrix.runtime }}
-         path: packages
-
-     - name: Publish DEB package
-       env:
-         BUILDKITE_TOKEN: ${{ secrets.BUILDKITE_TOKEN }}
-       run: |
-         FILE=$(echo packages/*.deb)
-         curl -X POST https://api.buildkite.com/v2/packages/organizations/sourcegit/registries/sourcegit-deb/packages \
-           -H "Authorization: Bearer $BUILDKITE_TOKEN" \
-           -F "file=@$FILE" \
-           --fail
-
-     - name: Publish RPM package
-       env:
-         BUILDKITE_TOKEN: ${{ secrets.BUILDKITE_TOKEN }}
-       run: |
-         FILE=$(echo packages/*.rpm)
-         curl -X POST https://api.buildkite.com/v2/packages/organizations/sourcegit/registries/sourcegit-rpm/packages \
-           -H "Authorization: Bearer $BUILDKITE_TOKEN" \
-           -F "file=@$FILE" \
-           --fail

.github/workflows/release.yml

@@ -24,12 +24,6 @@ jobs:
     uses: ./.github/workflows/package.yml
     with:
       version: ${{ needs.version.outputs.version }}
-  publish-packages:
-    needs: [package, version]
-    name: Publish Packages
-    uses: ./.github/workflows/publish-packages.yml
-    secrets:
-      BUILDKITE_TOKEN: ${{ secrets.BUILDKITE_TOKEN }}
   release:
     needs: [package, version]
     name: Release