feat(run): add alt-w keybind to filter by selected workflow

The keybinding uses `gh fzf workflow` for selection.

README.md

@@ -209,6 +209,8 @@ that can be used with any `gh fzf` command:
     > **NOTE:** The run watching process is executed in the background, so
     > closing `gh-fzf` won't prevent the desktop notification from displaying.
     > Use `killall gh` to end all `gh` processes, including the run watcher.
+  - `alt-w`: Filter the list, showing runs for the selected item from
+    `gh fzf workflow` (see [`workflow`](#workflow))
   - `alt-b`: Filter the list, showing runs from the current branch
   - `alt-u`: Filter the list, showing runs triggered by you
   - `alt-f`: Filter the list, showing failed runs

gh-fzf

@@ -379,7 +379,7 @@ run_cmd() {
 
     # KEYBINDING HINTS {{{2
     run_header="Actions > (enter: watch/logs) (alt-r: rerun) (alt-R: rerun failed) (alt-x: cancel) (alt-n: notify) (alt-p: pr) (alt-d: download)
-Filters > (alt-f: failed) (alt-i: in_progress) (alt-b: current branch) (alt-u: current user)
+Filters > (alt-f: failed) (alt-i: in_progress) (alt-b: current branch) (alt-u: current user) (alt-w: workflow)
 $global_binds
 
 "
@@ -403,6 +403,7 @@ $global_binds
         --bind="alt-R:execute(gh run rerun --failed {-1} $REPO_FLAG)+refresh-preview" \
         --bind="alt-d:execute(gh run download {-1} $REPO_FLAG)+refresh-preview" \
         --bind="alt-x:execute(gh run cancel {-1} $REPO_FLAG)+refresh-preview" \
+        --bind="alt-w:execute(gh fzf workflow $REPO_FLAG)" \
         --bind="alt-n:execute-silent(
             gh fzf util notify-run-completed {-1} $REPO_FLAG &
         )+refresh-preview" \