ci: make cd idempotent (#33)

- make cd idempotent

Author: wislertt

.github/workflows/cd.yml

@@ -15,22 +15,46 @@ jobs:
         name: versioning
         runs-on: ubuntu-latest
         outputs:
-            new_release_version: ${{ steps.release.outputs.new_release_version }}
-            new_release_published: ${{ steps.release.outputs.new_release_published }}
+            new_release_version: ${{ steps.set-outputs.outputs.version }}
+            new_release_published: ${{ steps.set-outputs.outputs.published }}
         steps:
             - name: Checkout
               uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
               with:
                   fetch-depth: 0
 
+            - name: Check existing release
+              id: check-release
+              run: |
+                  CURRENT_SHA=$(git rev-parse HEAD)
+                  EXISTING_TAG=$(git tag --points-at $CURRENT_SHA | grep '^v' | head -1)
+                  if [ -n "$EXISTING_TAG" ]; then
+                      echo "existing_tag=$EXISTING_TAG" >> $GITHUB_OUTPUT
+                      echo "existing_version=${EXISTING_TAG#v}" >> $GITHUB_OUTPUT
+                      echo "has_existing=true" >> $GITHUB_OUTPUT
+                  else
+                      echo "has_existing=false" >> $GITHUB_OUTPUT
+                  fi
+
             - id: release
               name: Release
+              if: steps.check-release.outputs.has_existing == 'false'
               uses: cycjimmy/semantic-release-action@16ca923e6ccbb50770c415a0ccd43709a8c5f7a4 # v4.2.2
               env:
                   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-            - name: Use version output
-              run: echo "Released version is ${{ steps.release.outputs.new_release_version }}"
+            - name: Set outputs
+              id: set-outputs
+              run: |
+                  if [ "${{ steps.check-release.outputs.has_existing }}" == "true" ]; then
+                      echo "version=${{ steps.check-release.outputs.existing_version }}" >> $GITHUB_OUTPUT
+                      echo "published=true" >> $GITHUB_OUTPUT
+                      echo "Using existing release: ${{ steps.check-release.outputs.existing_version }}"
+                  else
+                      echo "version=${{ steps.release.outputs.new_release_version }}" >> $GITHUB_OUTPUT
+                      echo "published=${{ steps.release.outputs.new_release_published }}" >> $GITHUB_OUTPUT
+                      echo "New release: ${{ steps.release.outputs.new_release_version }}"
+                  fi
 
     release-bin:
         name: release-bin-github-${{ matrix.name }}
@@ -126,4 +150,4 @@ jobs:
                   sed -i "s/^version = \".*\"/version = \"${{ needs.versioning.outputs.new_release_version }}\"/" Cargo.toml
 
             - name: Release to crates.io
-              run: cargo publish --token ${{ secrets.CARGO_TOKEN }} --allow-dirty
+              run: cargo publish --token ${{ secrets.CARGO_TOKEN }} --allow-dirty || true