Use branch latest sha in nightly OCI

Instead of the SHA from the GitHub context, which returns the SHA from
the cloned repository (so always main). The SHA from main then ends up
in the broker version, which is confusing for other branches.

Author: acogoluegnes

.github/workflows/oci-make-nightly.yaml

@@ -39,14 +39,21 @@ jobs:
           fetch-depth: 0
           filter: blob:none
 
-      - name: Determine closes tag
+      - name: Determine closest tag
         id: tag
         if: matrix.branch != 'main'
         shell: bash
         run: |
           t=$(git describe --tags --abbrev=0 ${{ matrix.branch }})
           printf "project_version=%s\n" "${t:1}" | tee -a "$GITHUB_OUTPUT"
 
+      - name: Get current SHA
+        id: sha
+        shell: bash
+        run: |
+          sha=$(git rev-parse HEAD)
+          printf "current_sha=%s\n" "$sha" | tee -a "$GITHUB_OUTPUT"
+
       - name: Configure Erlang
         uses: erlef/setup-beam@v1
         with:
@@ -56,7 +63,7 @@ jobs:
       - name: make package-generic-unix
         id: make
         run: |
-          make package-generic-unix PROJECT_VERSION=${{ matrix.project_version || steps.tag.outputs.project_version }}+${{ github.sha }}
+          make package-generic-unix PROJECT_VERSION=${{ matrix.project_version || steps.tag.outputs.project_version }}+${{ steps.sha.outputs.current_sha }}
 
       - name: Upload package-generic-unix
         uses: actions/upload-artifact@v4
@@ -84,6 +91,13 @@ jobs:
         with:
           ref: ${{ matrix.branch }}
 
+      - name: Get current SHA
+        id: sha
+        shell: bash
+        run: |
+          sha=$(git rev-parse HEAD)
+          printf "current_sha=%s\n" "$sha" | tee -a "$GITHUB_OUTPUT"
+
       - name: Download package-generic-unix
         uses: actions/download-artifact@v5
         with:
@@ -133,4 +147,4 @@ jobs:
           cache-from: type=gha,scope=${{ matrix.otp_version }}
           build-args: |
             OTP_VERSION=${{ matrix.otp_version }}
-            RABBITMQ_VERSION=${{ matrix.branch }}+${{ github.sha }}
+            RABBITMQ_VERSION=${{ matrix.branch }}+${{ steps.sha.outputs.current_sha }}