Fix workflows for version bump (#17162)

# Objective

- Version bump workflow fails due to a permission issue
- Fixes #17153

## Solution

- Add the required permissions
- Also remove workflow not used anymore since the RC

.github/workflows/post-release.yml

@@ -8,9 +8,12 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  ci:
+  bump:
     if: github.repository == 'bevyengine/bevy'
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
     steps:
       - uses: actions/checkout@v4
 

.github/workflows/release.yml

@@ -1,55 +0,0 @@
-name: Release
-
-# how to trigger: https://docs.github.com/en/actions/managing-workflow-runs/manually-running-a-workflow
-on:
-  workflow_dispatch:
-
-env:
-  CARGO_TERM_COLOR: always
-
-jobs:
-  ci:
-    if: github.repository == 'bevyengine/bevy'
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Install cargo-release
-        run: cargo install cargo-release
-
-      - name: Setup release
-        run: |
-          # Set the commit author to the github-actions bot. See discussion here for more information:
-          # https://github.com/actions/checkout/issues/13#issuecomment-724415212
-          # https://github.community/t/github-actions-bot-email-address/17204/6
-          git config user.name 'Bevy Auto Releaser'
-          git config user.email '41898282+github-actions[bot]@users.noreply.github.com'
-          # release: remove the dev suffix, like going from 0.X.0-dev to 0.X.0
-          # --workspace: updating all crates in the workspace
-          # --no-publish: do not publish to crates.io
-          # --execute: not a dry run
-          # --no-tag: do not push tag for each new version
-          # --no-push: do not push the update commits
-          # --dependent-version upgrade: change 0.X.0-dev in internal dependencies to 0.X.0
-          # --exclude: ignore those packages
-          cargo release release \
-            --workspace \
-            --no-publish \
-            --execute \
-            --no-tag \
-            --no-confirm \
-            --no-push \
-            --dependent-version upgrade \
-            --exclude ci \
-            --exclude errors \
-            --exclude bevy_mobile_example \
-            --exclude build-wasm-example
-
-      - name: Create PR
-        uses: peter-evans/create-pull-request@v7
-        with:
-          delete-branch: true
-          base: "main"
-          title: "Preparing Next Release"
-          body: |
-            Preparing next release. This PR has been auto-generated.