ingest workflow: Add trial_name input

Allow trial runs to be uploaded to the S3 bucket with the additional
`/trial/<trial_name>` prefix and do not trigger rebuilds when doing a
trial run.

This was easily done because the `s3_dst` has been made a top level
config param in the previous commit.

.github/workflows/fetch-and-ingest.yaml

@@ -26,9 +26,40 @@ on:
 
   # Manually triggered using GitHub's UI
   workflow_dispatch:
+    inputs:
+      trial_name:
+        description: 'Short name for a trial run. WARNING: without this we will overwrite files in s3://nextstrain-data/files/workflows/rsv'
 
 jobs:
+  set_config_overrides:
+    runs-on: ubuntu-latest
+    steps:
+      - id: s3_dst
+        run: |
+          S3_DST=s3://nextstrain-data/files/workflows/rsv
+
+          if [[ -n "$TRIAL_NAME" ]]; then
+            S3_DST+=/trial/"$TRIAL_NAME"
+          fi
+
+          echo "s3_dst=$S3_DST" >> "$GITHUB_OUTPUT"
+        env:
+          TRIAL_NAME: ${{ inputs.trial_name }}
+      - id: trigger_rebuild
+        run: |
+          TRIGGER_REBUILD=true
+
+          if [[ -n "$TRIAL_NAME" ]]; then
+            TRIGGER_REBUILD=false
+          fi
+
+          echo "trigger_rebuild=$TRIGGER_REBUILD" >> "$GITHUB_OUTPUT"
+    outputs:
+      s3_dst: ${{ steps.s3_dst.outputs.s3_dst }}
+      trigger_rebuild: ${{ steps.trigger_rebuild.outputs.trigger_rebuild }}
+
   fetch-and-ingest:
+    needs: [set_config_overrides]
     permissions:
       id-token: write
     uses: nextstrain/.github/.github/workflows/pathogen-repo-build.yaml@master
@@ -45,6 +76,12 @@ jobs:
           --env AWS_ACCESS_KEY_ID \
           --env AWS_SECRET_ACCESS_KEY \
           --env PAT_GITHUB_DISPATCH="$GH_TOKEN_NEXTSTRAIN_BOT_WORKFLOW_DISPATCH" \
+          --env S3_DST \
+          --env TRIGGER_REBUILD \
           ingest \
             --configfiles config/config.yaml config/optional.yaml \
+            --config s3_dst="$S3_DST" trigger_rebuild="$TRIGGER_REBUILD" \
             --printshellcmds
+      env: |
+        S3_DST: ${{ needs.set_config_overrides.outputs.s3_dst }}
+        TRIGGER_REBUILD: ${{ needs.set_config_overrides.outputs.trigger_rebuild }}