chore: initial commit

.gitignore

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+node_modules/

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org>

README.md

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+# GCC Snapshot
+
+Sets up the latest GCC snapshot ready-to-use.
+
+It uses the package from https://jwakely.github.io/pkg-gcc-latest/
+and thus requires an Ubuntu runner.
+
+It has no output or required input arguments.
+It uses no secrets.
+
+It prepends to `PATH` and `LD_RUN_PATH`
+so that the snapshot is ready-to-use.
+
+## Optional input argument
+
+`cache`:
+Whether to use `@actions/cache` for the snapshot.
+`true` (default) or `false`.
+
+## Example
+
+```yml
+on: push
+jobs:
+  gcc-snapshot:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: johelegp/gcc-snapshot@v1 # This action.
+      - uses: actions/checkout@v2
+      - uses: johelegp/modern-cmake-buildsystem@v1
+```

action.yml

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+name: 'GCC Snapshot'
+description: 'Sets up the latest GCC snapshot ready-to-use.'
+inputs:
+  cache:
+    description: 'Whether to use @actions/cache for the snapshot. `true` (default) or `false`.'
+    required: false
+    default: true
+runs:
+  using: 'node12'
+  main: 'dist/index.js'