Set build timestamp for reproducible builds

Author: michaelmior

.github/workflows/ci.yml

@@ -69,6 +69,9 @@ jobs:
     - uses: actions/checkout@v4
     - name: Coursier cache
       uses: coursier/cache-action@v6
+    - uses: taiki-e/install-action@parse-changelog
+    - name: Set build timestamp
+      run:  echo "SOURCE_DATE_EPOCH=$(date -d $(parse-changelog CHANGELOG.md -t | rev | cut -d' ' -f1 | rev) '+%s')" >> "$GITHUB_ENV"
     - uses: coursier/setup-action@v1
       with:
         jvm: adopt:8

.github/workflows/docker.yml

@@ -19,6 +19,9 @@ jobs:
     - uses: actions/checkout@v4
     - name: Coursier cache
       uses: coursier/cache-action@v6
+    - uses: taiki-e/install-action@parse-changelog
+    - name: Set build timestamp
+      run:  echo "SOURCE_DATE_EPOCH=$(date -d $(parse-changelog CHANGELOG.md -t | rev | cut -d' ' -f1 | rev) '+%s')" >> "$GITHUB_ENV"
     - uses: coursier/setup-action@v1
       with:
         jvm: adopt:8