Add workflows for tests, lint, and tag

.github/workflows/ociregistry-lint.yml

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+name: "ociregistry: lint"
+
+on:
+  pull_request:
+    paths:
+      - "ociregistry/**"
+      - ".github/workflows/ociregistry-lint.yml"
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ociregistry
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: ociregistry/go.mod
+          cache-dependency-path: ociregistry/go.sum
+
+      - name: Run golangci-lint
+        uses: golangci/golangci-lint-action@v7
+        with:
+          version: v2.10.1
+          working-directory: ociregistry

.github/workflows/ociregistry-tag.yml

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+name: "ociregistry: tag"
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "ociregistry/**"
+      - ".github/workflows/ociregistry-tag.yml"
+
+permissions:
+  contents: write
+
+jobs:
+  tag:
+    name: Bump version and tag
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: "0"
+
+      - name: Bump version and push tag
+        uses: anothrNick/github-tag-action@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          DEFAULT_BUMP: patch
+          INITIAL_VERSION: 0.0.0
+          TAG_PREFIX: ociregistry/v
+          MAJOR_STRING_TOKEN: (MAJOR)
+          MINOR_STRING_TOKEN: (MINOR)
+          BRANCH_HISTORY: compare

.github/workflows/ociregistry-test.yml

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+name: "ociregistry: test"
+
+on:
+  pull_request:
+    paths:
+      - "ociregistry/**"
+      - ".github/workflows/ociregistry-test.yml"
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ociregistry
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: ociregistry/go.mod
+          cache-dependency-path: ociregistry/go.sum
+
+      - name: Run tests
+        run: go test -race -count=1 ./...