ci: fix releaserc (#24)

Author: daniel-butler-irl

.releaserc

@@ -1,12 +1,15 @@
 {
-  "tagFormat": "${version}",
+  "tagFormat": "v${version}",
+  "branches": ["main"],
   "plugins": [
     "@semantic-release/commit-analyzer",
     "@semantic-release/release-notes-generator",
-    "@semantic-release/changelog",
-    ["@semantic-release/github",{
-      "githubUrl": "https://github.ibm.com",
-      "githubApiPathPrefix": "/api/v3"
+    "@semantic-release/github",
+    ["@semantic-release/git", {
+      "assets": "false"
+    }],
+    ["@semantic-release/exec", {
+      "successCmd": "echo \"SEMVER_VERSION=${nextRelease.version}\" >> $GITHUB_ENV"
     }]
   ]
 }