Add decompile runner workflow

.gitea/workflows/decompile.yml

@@ -0,0 +1,52 @@
+name: Decompile upstream jar
+
+on:
+  workflow_dispatch:
+
+jobs:
+  decompile:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '21'
+
+      - name: Download upstream mod and CFR
+        shell: bash
+        run: |
+          mkdir -p upstream tools build/decompiled
+          curl --fail-with-body --location \
+            --output upstream/Explosion-Overhaul-0.2.3.0-forge.jar \
+            "https://cdn.modrinth.com/data/sOxnTLKl/versions/93XGK0uB/Explosion-Overhaul-0.2.3.0-forge-.jar"
+          curl --fail-with-body --location \
+            --output tools/cfr.jar \
+            "https://www.benf.org/other/cfr/cfr-0.152.jar"
+
+      - name: Decompile
+        shell: bash
+        run: |
+          java -jar tools/cfr.jar upstream/Explosion-Overhaul-0.2.3.0-forge.jar \
+            --outputdir build/decompiled \
+            --silent false \
+            --comments false \
+            --caseinsensitivefs true
+
+      - name: Copy metadata
+        shell: bash
+        run: |
+          unzip -p upstream/Explosion-Overhaul-0.2.3.0-forge.jar META-INF/mods.toml > build/decompiled/mods.toml
+          unzip -p upstream/Explosion-Overhaul-0.2.3.0-forge.jar explosionoverhaul.mixins.json > build/decompiled/explosionoverhaul.mixins.json
+          find build/decompiled -maxdepth 3 -type f | sort > build/decompiled-file-list.txt
+
+      - name: Upload decompiled sources
+        uses: actions/upload-artifact@v3
+        with:
+          name: explosion-overhaul-decompiled-0.2.3.0-forge
+          path: |
+            build/decompiled/**
+            build/decompiled-file-list.txt