Add publish CI workflows

Author: CAD97

.github/workflows/publish-erasable.yaml

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+on:
+  push:
+    tags:
+      - 'erasable@*'
+
+jobs:
+  publish:
+    name: Publish
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install stable
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - name: Publish
+        run: cargo publish -p erasable
+        env:
+          CARGO_REGISTRY_TOKEN: ${{secrets.CRATES_IO_API_TOKEN}}

.github/workflows/publish-ptr-union.yaml

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+on:
+  push:
+    tags:
+      - 'ptr-union@*'
+
+jobs:
+  publish:
+    name: Publish
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install stable
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - name: Publish
+        run: cargo publish -p ptr-union
+        env:
+          CARGO_REGISTRY_TOKEN: ${{secrets.CRATES_IO_API_TOKEN}}

.github/workflows/publish-rc-borrow.yaml

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+on:
+  push:
+    tags:
+      - 'rc-borrow@*'
+
+jobs:
+  publish:
+    name: Publish
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install stable
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - name: Publish
+        run: cargo publish -p rc-borrow
+        env:
+          CARGO_REGISTRY_TOKEN: ${{secrets.CRATES_IO_API_TOKEN}}

.github/workflows/publish-rc-box.yaml

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+on:
+  push:
+    tags:
+      - 'rc-box@*'
+
+jobs:
+  publish:
+    name: Publish
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install stable
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - name: Publish
+        run: cargo publish -p rc-box
+        env:
+          CARGO_REGISTRY_TOKEN: ${{secrets.CRATES_IO_API_TOKEN}}

.github/workflows/publish-slice-dst.yaml

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+on:
+  push:
+    tags:
+      - 'slice-dst@*'
+
+jobs:
+  publish:
+    name: Publish
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install stable
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - name: Publish
+        run: cargo publish -p slice-dst
+        env:
+          CARGO_REGISTRY_TOKEN: ${{secrets.CRATES_IO_API_TOKEN}}