ci: add reusable nightly build workflow

.github/workflows/technology-nightly.yml

@@ -0,0 +1,73 @@
+name: Nightly
+
+on:
+  workflow_call:
+    inputs:
+      version:
+        description: Semantic Version string to use for this nightly build. It should ends with `-SNAPSHOT`. If not, please take a look at the release workflow.
+        required: false
+        type: string
+
+jobs:
+
+  Secrets-Presence:
+    if: always()
+    name: "Check for required credentials"
+    runs-on: ubuntu-latest
+    outputs:
+      HAS_OSSRH: ${{ steps.secrets-presence.outputs.HAS_OSSRH }}
+      HAS_WEBHOOK: ${{ steps.secrets-presence.outputs.HAS_WEBHOOK }}
+    steps:
+      - name: Check whether secrets exist
+        id: secrets-presence
+        run: |
+          [ ! -z "${{ secrets.ORG_GPG_PASSPHRASE }}" ] &&
+          [ ! -z "${{ secrets.ORG_GPG_PRIVATE_KEY }}" ] &&
+          [ ! -z "${{ secrets.ORG_OSSRH_USERNAME }}" ] && echo "HAS_OSSRH=true" >> $GITHUB_OUTPUT
+          [ ! -z "${{ secrets.DISCORD_GITHUB_CI_WEBHOOK }}" ] && echo "HAS_WEBHOOK=true" >> $GITHUB_OUTPUT
+          exit 0
+
+  Determine-Version:
+    if: always()
+    runs-on: ubuntu-latest
+    outputs:
+      VERSION: ${{ steps.get-version.outputs.VERSION }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: "Get version"
+        id: get-version
+        run: |
+          if [ -z ${{ inputs.version }} ]; then
+            echo "VERSION=$(IFS=.- read -r RELEASE_VERSION_MAJOR RELEASE_VERSION_MINOR RELEASE_VERSION_PATCH SNAPSHOT<<<$(grep "version" gradle.properties | awk -F= '{print $2}') && echo $RELEASE_VERSION_MAJOR.$RELEASE_VERSION_MINOR.$RELEASE_VERSION_PATCH-$(date +"%Y%m%d")-SNAPSHOT)" >> "$GITHUB_OUTPUT"
+          else
+            echo "VERSION=${{ inputs.version }}" >> "$GITHUB_OUTPUT"
+          fi
+
+  Publish-Artefacts:
+    runs-on: ubuntu-latest
+    needs: [ Secrets-Presence, Determine-Version ]
+    if: |
+      needs.Secrets-Presence.outputs.HAS_OSSRH
+    steps:
+      - uses: eclipse-edc/.github/.github/actions/publish-maven-artifacts@main
+        with:
+          version: ${{ needs.Determine-Version.outputs.VERSION }}
+          gpg-private-key: ${{ secrets.ORG_GPG_PRIVATE_KEY }}
+          gpg-passphrase: ${{ secrets.ORG_GPG_PASSPHRASE }}
+          osshr-username: ${{ secrets.ORG_OSSRH_USERNAME }}
+          osshr-password: ${{ secrets.ORG_OSSRH_PASSWORD }}
+
+  Post-To-Discord:
+    needs: [ Publish-Artefacts, Determine-Version, Secrets-Presence ]
+    if: "needs.Secrets-Presence.outputs.HAS_WEBHOOK && always()"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: sarisia/actions-status-discord@v1
+        name: "Invoke discord webhook"
+        with:
+          webhook: ${{ secrets.DISCORD_GITHUB_CI_WEBHOOK }}
+          # if the publishing is skipped, that means the preceding test run failed
+          status: ${{ needs.Publish-Artefacts.result == 'skipped' && 'Failure' || needs.Publish-Artefacts.result }}
+          title: "Nightly ${{ github.repository }} build"
+          description: "Build and publish ${{ needs.Determine-Version.outputs.VERSION }}"
+          username: GitHub Actions