refactor: Create SigningDriver and CiDriver (#197)

This also includes a new `login` command. The signing and CI logic is now using the Driver trait system along with a new experimental sigstore signing driver. New static macros have also been created to make implementation management easier for `Command` usage and `Driver` trait implementation calls.

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Co-authored-by: xyny <60004820+xynydev@users.noreply.github.com>

test-files/github-events/branch.json

@@ -0,0 +1,10 @@
+{
+  "ref": "refs/heads/test-branch",
+  "repository": {
+    "default_branch": "main",
+    "owner": {
+      "login": "test-owner"
+    },
+    "html_url": "https://example.com/"
+  }
+}

test-files/github-events/default-branch.json

@@ -0,0 +1,10 @@
+{
+  "ref": "refs/heads/main",
+  "repository": {
+    "default_branch": "main",
+    "owner": {
+      "login": "test-owner"
+    },
+    "html_url": "https://example.com/"
+  }
+}

test-files/github-events/pr-branch.json

@@ -0,0 +1,15 @@
+{
+  "head": {
+    "ref": "test-branch"
+  },
+  "base": {
+    "ref": "main"
+  },
+  "repository": {
+    "default_branch": "main",
+    "owner": {
+      "login": "test-owner"
+    },
+    "html_url": "https://example.com/"
+  }
+}

test-files/keys/cosign.key

@@ -0,0 +1,11 @@
+-----BEGIN ENCRYPTED SIGSTORE PRIVATE KEY-----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+-----END ENCRYPTED SIGSTORE PRIVATE KEY-----

test-files/keys/cosign.pub

@@ -0,0 +1,4 @@
+-----BEGIN PUBLIC KEY-----
+MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEq8TdgrRtcWVq6MXuB2uznS14EOQ9
+Ol41BztsDr0Qd8BGfYM6lOkZ+/NLteBFZ9gQsgVhVrjrSifcHmMAUOZYwg==
+-----END PUBLIC KEY-----