let workflow_dispatch run the ecosystem job (experiment)

Author: KotlinIsland

.github/workflows/ci.yaml

@@ -615,20 +615,16 @@ jobs:
     needs: determine_changes
     # Only runs on pull requests, since that is the only we way we can find the base version for comparison.
     # Ecosystem check needs linter and/or formatter changes.
-    if: |
-      !contains(github.event.pull_request.labels.*.name, 'no-test') && github.event_name == 'pull_request' &&
-      (
-        needs.determine_changes.outputs.linter == 'true' ||
-        needs.determine_changes.outputs.formatter == 'true'
-      )
-    timeout-minutes: 20
     env:
       # Line-tables-only debug info: faster builds, backtraces still work.
       CARGO_PROFILE_DEV_DEBUG: line-tables-only
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
-          ref: ${{ github.event.pull_request.base.ref }}
+          # on workflow_dispatch there is no PR base; fall back to the dispatched
+          # branch so baseline == comparison (we just want to see if the binary
+          # errors on the corpus)
+          ref: ${{ github.ref_name }}
           persist-credentials: false
 
       - uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
@@ -666,7 +662,6 @@ jobs:
           uv pip install ./python/ruff-ecosystem
 
       - name: Run `ruff check` stable ecosystem check
-        if: ${{ needs.determine_changes.outputs.linter == 'true' }}
         run: |
           # Set pipefail to avoid hiding errors with tee
           set -eo pipefail
@@ -679,7 +674,6 @@ jobs:
           echo "" >> ecosystem-result
 
       - name: Run `ruff check` preview ecosystem check
-        if: ${{ needs.determine_changes.outputs.linter == 'true' }}
         run: |
           # Set pipefail to avoid hiding errors with tee
           set -eo pipefail
@@ -692,7 +686,6 @@ jobs:
           echo "" >> ecosystem-result
 
       - name: Run `ruff format` stable ecosystem check
-        if: ${{ needs.determine_changes.outputs.formatter == 'true' }}
         run: |
           # Set pipefail to avoid hiding errors with tee
           set -eo pipefail
@@ -705,7 +698,6 @@ jobs:
           echo "" >> ecosystem-result
 
       - name: Run `ruff format` preview ecosystem check
-        if: ${{ needs.determine_changes.outputs.formatter == 'true' }}
         run: |
           # Set pipefail to avoid hiding errors with tee
           set -eo pipefail