compile-perf: fix Windows runner — add bash to PATH, use python3

The release sweep uses shell: bash steps but doesn't go through
common-setup (no build needed), so Git Bash wasn't on PATH.
Also replace bare 'python' with 'python3' throughout both workflows —
Windows doesn't have a 'python' alias by default.

Author: jvepsalainen-nv

.github/workflows/compile-perf-nightly.yml

@@ -121,9 +121,9 @@ jobs:
           args=(--slangc "$SLANGC" --label "$LABEL" --out "$RESULTS/daily" --samples "$SAMPLES" --warmup 1)
           [ -n "$ONLY" ] && args+=(--only "$ONLY")
           # Daily ToT sweep -> perf-results/daily/<label>/results.json
-          python bench.py "${args[@]}"
+          python3 bench.py "${args[@]}"
           # Stamp meta + rebuild perf-results/tracking/tracking.json
-          python track.py register --results "$RESULTS" --index "$RESULTS/index.json" \
+          python3 track.py register --results "$RESULTS" --index "$RESULTS/index.json" \
             --label "$LABEL" --commit "$COMMIT" --corpus-sha "$CORPUS_SHA"
 
       - name: Push results
@@ -164,7 +164,7 @@ jobs:
             exit 0
           fi
           cd "$SUITE"
-          python report.py --results "$RESULTS" --index "$RESULTS/index.json"
+          python3 report.py --results "$RESULTS" --index "$RESULTS/index.json"
 
       - name: Checkout gh-pages branch
         continue-on-error: true
@@ -233,4 +233,4 @@ jobs:
         run: |
           set -euo pipefail
           cd "$GITHUB_WORKSPACE/tools/compile-perf"
-          python trend.py --results "$GITHUB_WORKSPACE/perf-results"
+          python3 trend.py --results "$GITHUB_WORKSPACE/perf-results"

.github/workflows/compile-perf-release-sweep.yml

@@ -43,6 +43,12 @@ jobs:
       group: nvrgfx
       labels: [Windows, X64, nvrgfx-perf]
     steps:
+      - name: Add bash to PATH (Windows)
+        shell: pwsh
+        run: |
+          Add-Content -Path $env:GITHUB_PATH -Value "C:\Program Files\Git\bin"
+          Add-Content -Path $env:GITHUB_PATH -Value "C:\Program Files\Git\usr\bin"
+
       # No Slang build here — we sweep prebuilt RELEASE binaries. fetch-depth 0
       # is needed so fetch_releases.py can read release tags + dates from git.
       - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
@@ -93,16 +99,16 @@ jobs:
           cd "$SUITE"
           force=(); [ "$FORCE_ENABLED" = "true" ] && force=(--force)
           # Prebuilt slangc for each release, matching THIS runner's platform.
-          python fetch_releases.py --repo "$GITHUB_WORKSPACE" \
+          python3 fetch_releases.py --repo "$GITHUB_WORKSPACE" \
             --since "$SINCE" --until "$UNTIL" "${force[@]}"
           # Sweep every release into the results repo (history baseline).
-          python sweep.py --index releases/index.json --results "$RESULTS" \
+          python3 sweep.py --index releases/index.json --results "$RESULTS" \
             --samples "$SAMPLES" "${force[@]}"
           # Store the release manifest, stamp the runner the history was built on,
           # and rebuild the tracking series.
           cp releases/index.json "$RESULTS/index.json"
-          python track.py stamp-runner --results "$RESULTS" --label "release-sweep-$(date -u +%Y-%m-%d)"
-          python track.py rebuild --results "$RESULTS" --index "$RESULTS/index.json"
+          python3 track.py stamp-runner --results "$RESULTS" --label "release-sweep-$(date -u +%Y-%m-%d)"
+          python3 track.py rebuild --results "$RESULTS" --index "$RESULTS/index.json"
 
       - name: Push results
         shell: bash
@@ -113,7 +119,7 @@ jobs:
           git config user.email "slang-perf-bot@users.noreply.github.com"
           git add -A
           if git diff --cached --quiet; then echo "no changes"; exit 0; fi
-          git commit -m "release history resync $(date -u +%Y-%m-%d) (runner $(python "$GITHUB_WORKSPACE/tools/compile-perf/track.py" runner-id))"
+          git commit -m "release history resync $(date -u +%Y-%m-%d) (runner $(python3 "$GITHUB_WORKSPACE/tools/compile-perf/track.py" runner-id))"
           git push
 
       - name: Revoke PAT from perf-results git config
@@ -138,7 +144,7 @@ jobs:
             exit 0
           fi
           cd "$SUITE"
-          python report.py --results "$RESULTS" --index "$RESULTS/index.json"
+          python3 report.py --results "$RESULTS" --index "$RESULTS/index.json"
 
       - name: Checkout gh-pages branch
         continue-on-error: true