scaffolding: root README, plan, VS Code build tasks, Gitea Actions release workflow

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MmdG9GqfSWCzts7AkDwRDh

.gitea/workflows/release.yml

@@ -0,0 +1,105 @@
+name: release-tools
+
+# På varje push till master/main: bygg de tools som fått ändringar
+# (linux x64 + arm64) och lägg binärerna på en rullande
+# "<tool>-latest"-release på släppsidan i Gitea.
+on:
+  push:
+    branches: [master, main]
+  workflow_dispatch: {} # manuell körning bygger ALLA tools
+
+jobs:
+  build-release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # hela historiken behövs för diffen mot 'before'
+
+      - name: Detektera ändrade tools
+        id: changed
+        run: |
+          TOOLS="pixel-sprite-maker mesh-tool"
+          BEFORE="${{ github.event.before }}"
+          CHANGED=""
+          if [ "${{ github.event_name }}" = "workflow_dispatch" ] \
+             || [ -z "$BEFORE" ] \
+             || echo "$BEFORE" | grep -Eq '^0+$' \
+             || ! git cat-file -e "$BEFORE" 2>/dev/null; then
+            echo "första push / manuell körning -> bygger alla tools"
+            CHANGED="$TOOLS"
+          else
+            for t in $TOOLS; do
+              if ! git diff --quiet "$BEFORE" "${{ github.sha }}" -- "$t/"; then
+                CHANGED="$CHANGED $t"
+              fi
+            done
+          fi
+          CHANGED="$(echo $CHANGED)"   # trimma whitespace
+          echo "tools=$CHANGED" >> "$GITHUB_OUTPUT"
+          echo "bygger: ${CHANGED:-inget}"
+
+      - name: Installera Go
+        if: steps.changed.outputs.tools != ''
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.24"
+          cache: false
+
+      - name: Testa + bygg (x64 + arm64)
+        if: steps.changed.outputs.tools != ''
+        run: |
+          set -e
+          VERSION="latest-$(git rev-parse --short HEAD)"
+          for t in ${{ steps.changed.outputs.tools }}; do
+            case "$t" in
+              pixel-sprite-maker) BIN=spritec ;;
+              mesh-tool)          BIN=mesht ;;
+              *) echo "okänt tool $t"; exit 1 ;;
+            esac
+            echo "=== $t ($BIN) ==="
+            cd "$t"
+            go test ./...
+            mkdir -p build
+            GOOS=linux GOARCH=amd64 go build -trimpath \
+              -ldflags "-s -w -X main.version=$VERSION" -o "build/$BIN-linux-x64" .
+            GOOS=linux GOARCH=arm64 go build -trimpath \
+              -ldflags "-s -w -X main.version=$VERSION" -o "build/$BIN-linux-arm64" .
+            (cd build && sha256sum "$BIN"-linux-* > checksums.txt && ls -la)
+            cd ..
+          done
+
+      - name: Skapa/uppdatera releaser + ladda upp binärer
+        if: steps.changed.outputs.tools != ''
+        env:
+          API: http://gitea-d:3000/api/v1
+          REPO: ${{ github.repository }}
+          TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set -e
+          for t in ${{ steps.changed.outputs.tools }}; do
+            case "$t" in
+              pixel-sprite-maker) BIN=spritec ;;
+              mesh-tool)          BIN=mesht ;;
+            esac
+            TAG="$t-latest"
+            BODY="$t (binär: $BIN) - rullande bygge från senaste master. Commit: ${{ github.sha }}. Arkitekturer: linux x64 + arm64 (Pi5)."
+            rid=$(curl -s -X POST "$API/repos/$REPO/releases" \
+              -H "Authorization: token $TOKEN" -H 'Content-Type: application/json' \
+              -d "{\"tag_name\":\"$TAG\",\"name\":\"$TAG\",\"body\":\"$BODY\"}" | jq -r '.id // empty')
+            [ -z "$rid" ] && rid=$(curl -s "$API/repos/$REPO/releases/tags/$TAG" \
+              -H "Authorization: token $TOKEN" | jq -r '.id')
+            echo "$t -> release id $rid"
+            for f in "$BIN-linux-x64" "$BIN-linux-arm64" checksums.txt; do
+              aid=$(curl -s "$API/repos/$REPO/releases/$rid/assets" \
+                -H "Authorization: token $TOKEN" | jq -r ".[] | select(.name==\"$f\") | .id")
+              if [ -n "$aid" ] && [ "$aid" != "null" ]; then
+                curl -s -X DELETE "$API/repos/$REPO/releases/$rid/assets/$aid" \
+                  -H "Authorization: token $TOKEN" -o /dev/null
+              fi
+              curl -s -X POST "$API/repos/$REPO/releases/$rid/assets?name=$f" \
+                -H "Authorization: token $TOKEN" \
+                -F "attachment=@$t/build/$f" -o /dev/null -w "  $f -> HTTP %{http_code}\n"
+            done
+          done