move computing the git tag into a separate Linux-only step (#1110)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: atoulme

.github/workflows/base-release.yaml

@@ -26,9 +26,24 @@ env:
   GORELEASER_PRO_VERSION: v2.11.2
 
 jobs:
-  prepare:
+  prev-tag:
     outputs:
       PREVIOUS_RELEASE_TAG: ${{ steps.prev-tag.outputs.PREVIOUS_RELEASE_TAG }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
+        with:
+          fetch-depth: 0
+      - name: Set goreleaser last tag reference in case of non-nightly release
+        id: prev-tag
+        if: inputs.nightly != 'true'
+        # find previous tag by filtering out nightly tags and binary release (OCB, OpAMP) tags and then choosing the
+        # second to last tag (last one is the current release)
+        run: |
+          prev_tag=$(git tag | grep -v "cmd" | grep -v "nightly" | sort -r --version-sort | head -n 2 | tail -n 1)
+          echo "PREVIOUS_RELEASE_TAG=$prev_tag" >> "$GITHUB_OUTPUT"
+
+  prepare:
     strategy:
       matrix:
         GOOS: ${{ fromJSON(inputs.goos) }}
@@ -80,15 +95,6 @@ jobs:
           go-version: "~1.24"
           check-latest: true
 
-      - name: Set goreleaser last tag reference in case of non-nightly release
-        id: prev-tag
-        if: inputs.nightly != 'true'
-        # find previous tag by filtering out nightly tags and binary release (OCB, OpAMP) tags and then choosing the
-        # second to last tag (last one is the current release)
-        run: |
-          prev_tag=$(git tag | grep -v "cmd" | grep -v "nightly" | sort -r --version-sort | head -n 2 | tail -n 1)
-          echo "PREVIOUS_RELEASE_TAG=$prev_tag" >> "$GITHUB_OUTPUT"
-
       - name: Set nightly enabled
         id: nightly-check
         if: inputs.nightly == 'true'
@@ -258,7 +264,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           COSIGN_YES: true
           GORELEASER_KEY: ${{ secrets.GORELEASER_KEY }}
-          GORELEASER_PREVIOUS_TAG: ${{ needs.prepare.outputs.PREVIOUS_RELEASE_TAG }}
+          GORELEASER_PREVIOUS_TAG: ${{ needs.prev-tag.outputs.PREVIOUS_RELEASE_TAG }}
           GORELEASER_CURRENT_TAG: ${{ github.ref_name }}
 
   create-issue: