Fix release tag double-prefix; stop codecov gating the repo (#4)

release.yaml built its tag as `v$version` and then interpolated it as
`v${{ ... }}` in both the existence test and the release itself, so every
tag landed as `vv2.8.0`. It also ran the existence test against a shallow
checkout with no tags fetched, so the test could never find anything.
Fetch tags and stop double-prefixing; existing vv* tags are left alone.

test-coverage has failed since July with Codecov "Repository not found"
-- a stale CODECOV_TOKEN or an unlinked repo, neither fixable from the
workflow. Coverage itself computes fine; only the upload to a third-party
service fails. continue-on-error keeps that step visibly red in the run
view without gating the repo on it, so the job reflects the code rather
than someone else's outage. The token still needs refreshing to restore
actual reporting.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: langbart

.github/workflows/release.yaml

@@ -12,6 +12,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
 
       - name: Extract version and changelog from NEWS.md
         id: changelog
@@ -37,7 +39,7 @@ jobs:
       - name: Check if tag exists
         id: check_tag
         run: |
-          if git rev-parse "v${{ steps.changelog.outputs.tag_name }}" >/dev/null 2>&1; then
+          if git rev-parse "${{ steps.changelog.outputs.tag_name }}" >/dev/null 2>&1; then
             echo "exists=true" >> $GITHUB_OUTPUT
           else
             echo "exists=false" >> $GITHUB_OUTPUT
@@ -47,7 +49,7 @@ jobs:
         if: steps.check_tag.outputs.exists == 'false'
         uses: softprops/action-gh-release@v2
         with:
-          tag_name: v${{ steps.changelog.outputs.tag_name }}
+          tag_name: ${{ steps.changelog.outputs.tag_name }}
           body: ${{ steps.changelog.outputs.changelog }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/test-coverage.yaml

@@ -38,7 +38,13 @@ jobs:
           covr::to_cobertura(cov)
         shell: Rscript {0}
 
+      # Coverage is computed above; this step only uploads it to a third-party
+      # service. It has been failing with "Repository not found" since July --
+      # a stale CODECOV_TOKEN or an unlinked repo, neither fixable from here.
+      # continue-on-error keeps the upload visibly red in the run view without
+      # gating the repo on someone else's outage.
       - uses: codecov/codecov-action@v4
+        continue-on-error: true
         with:
           fail_ci_if_error: ${{ github.event_name != 'pull_request' && true || false }}
           file: ./cobertura.xml