Set paths for tuner and shortfin workflows consistently. (#298)

Now these workflows will only run if files in one of these subproject
directories are touched.

This sets triggers consistently for `pull_request` and `push` events. In
other projects we've set all workflows to run on `push` events. We could
do that here too, just in case these triggers miss something prior to
merge.

Note that using `paths` filters on `pull_request` triggers breaks
"required checks". We currently only set `pre-commit` and `Unit Tests
and Type Checking (3.11, ubuntu-latest)` as required checks though.

Another option is to just always run these workflows with no filters at
all. The workflows are using free runners and are pretty fast (~5
minutes), so the predictability could be nice.

.github/workflows/ci-tuner.yml

@@ -3,9 +3,15 @@ name: CI - Tuner
 on:
   workflow_dispatch:
   pull_request:
+    paths:
+      - '.github/workflows/ci-tuner.yml'
+      - 'tuner/**'
   push:
     branches:
       - main
+    paths:
+      - '.github/workflows/ci-tuner.yml'
+      - 'tuner/**'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.number || github.sha }}

.github/workflows/ci_linux_x64-libshortfin.yml

@@ -9,6 +9,9 @@ name: CI - shortfin
 on:
   workflow_dispatch:
   pull_request:
+    paths:
+      - '.github/workflows/ci_linux_x64-libshortfin.yml'
+      - 'shortfin/**'
   push:
     branches:
       - main

.github/workflows/ci_linux_x64_asan-libshortfin.yml

@@ -9,6 +9,9 @@ name: CI - shortfin - ASan
 on:
   workflow_dispatch:
   pull_request:
+    paths:
+      - '.github/workflows/ci_linux_x64_asan-libshortfin.yml'
+      - 'shortfin/**'
   push:
     branches:
       - main

.github/workflows/ci_linux_x64_nogil-libshortfin.yml

@@ -9,6 +9,10 @@ name: CI - shortfin - Python 3.13 Free-threaded
 on:
   workflow_dispatch:
   pull_request:
+    paths:
+      - '.github/workflows/ci_linux_x64-libshortfin.yml'
+      - 'shortfin/**'
+
   push:
     branches:
       - main

.github/workflows/ci_windows_x64-libshortfin.yml

@@ -9,6 +9,9 @@ name: CI - shortfin - Windows
 on:
   workflow_dispatch:
   pull_request:
+    paths:
+      - '.github/workflows/ci_windows_x64-libshortfin.yml'
+      - 'shortfin/**'
   push:
     branches:
       - main