[chore] Correctly make use of previous tag in CI (#1229)

* copy over prev tag job

* add prev version to correct step

* add needs

Author: mowies

.github/workflows/base-ci-goreleaser.yaml

@@ -40,6 +40,23 @@ env:
   GORELEASER_PRO_VERSION: v2.12.5
 
 jobs:
+  prev-tag:
+    outputs:
+      PREVIOUS_RELEASE_TAG: ${{ steps.prev-tag.outputs.PREVIOUS_RELEASE_TAG }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          fetch-depth: 0
+      - name: Set goreleaser last tag reference in case of non-nightly release
+        id: prev-tag
+        if: inputs.nightly != 'true'
+        # find previous tag by filtering out nightly tags and binary release (OCB, OpAMP) tags and then choosing the
+        # second to last tag (last one is the current release)
+        run: |
+          prev_tag=$(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"
+
   check-goreleaser:
     strategy:
       matrix:
@@ -67,6 +84,7 @@ jobs:
           - GOOS: windows
             GOARCH: riscv64
     runs-on: ${{ inputs.runner_os }}
+    needs: prev-tag
     outputs:
       version: ${{ steps.prep.outputs.version }}
 
@@ -161,6 +179,7 @@ jobs:
           GOAMD64: v1
           GOPPC64: power8
           GORELEASER_KEY: ${{ secrets.GORELEASER_KEY }}
+          GORELEASER_PREVIOUS_TAG: ${{ needs.prev-tag.outputs.PREVIOUS_RELEASE_TAG }}
 
       - name: Move built artifacts
         if: inputs.distribution == 'otelcol-contrib' && inputs.nightly != true
@@ -184,6 +203,7 @@ jobs:
           GOAMD64: v1
           GOPPC64: power8
           GORELEASER_KEY: ${{ secrets.GORELEASER_KEY }}
+          GORELEASER_PREVIOUS_TAG: ${{ needs.prev-tag.outputs.PREVIOUS_RELEASE_TAG }}
 
       - name: Print built artifacts
         run: cat ./distributions/${{ inputs.distribution }}/dist/**/artifacts.json