feat(quantumsheep/sshs): scaffold quantumsheep/sshs (#29185)

* feat(quantumsheep/sshs): scaffold quantumsheep/sshs

* fix(quantumsheep/sshs): use regexp format to validate checksum

pkgs/quantumsheep/sshs/pkg.yaml

@@ -0,0 +1,4 @@
+packages:
+  - name: quantumsheep/[email protected]
+  - name: quantumsheep/sshs
+    version: 3.4.0

pkgs/quantumsheep/sshs/registry.yaml

@@ -0,0 +1,25 @@
+packages:
+  - type: github_release
+    repo_owner: quantumsheep
+    repo_name: sshs
+    description: Terminal user interface for SSH
+    version_constraint: "false"
+    version_overrides:
+      - version_constraint: semver("<= 3.4.0")
+        asset: sshs-{{.OS}}-{{.Arch}}
+        format: raw
+        windows_arm_emulation: true
+        checksum:
+          type: github_release
+          asset: "{{.Asset}}.sha256"
+          algorithm: sha256
+      - version_constraint: "true"
+        asset: sshs-{{.OS}}-{{.Arch}}
+        format: raw
+        checksum:
+          type: github_release
+          file_format: regexp
+          asset: "{{.Asset}}.sha256"
+          pattern:
+            checksum: ^(\b[A-Fa-f0-9]{64}\b)
+          algorithm: sha256