Have the action output a versioning element so it could be used as part of the cache restore key

.github/workflows/action.yml

@@ -7,6 +7,31 @@ env:
   GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
 
 jobs:
+  version:
+    name: Version with commit unique id
+    runs-on: ubuntu-latest
+    if: github.ref == 'refs/heads/main'
+    steps:
+      - uses: actions/checkout@v3
+      - name: Version it!
+        run: |
+          # We expect a string such as const setupBeamVersion = 'undefined' in the code
+          SHA=$(git rev-parse --short HEAD)
+          sed -i'.bak' \
+              -e "s/const setupBeamVersion = '.*'/const setupBeamVersion = '${SHA}'/g" \
+              dist/index.js
+          # it always starts by being 'undefined'
+          NEWVER=$(grep -oE "const setupBeamVersion = '.*'" dist/index.js | cut -d\' -f2)
+          if [ "$NEWVER" == "undefined" ]; then
+              exit 1
+          else
+              echo "Continuing... new version is ${NEWVER}"
+          fi
+          git config user.name "GitHub Actions"
+          git config user.email "[email protected]"
+          git add dist/index.js
+          git commit -m "Update setup-beam version output to ${SHA}"
+          git push origin main
   check_integrity:
     name: Expected local npm actions
     runs-on: ubuntu-latest

.github/workflows/ubuntu.yml

@@ -24,7 +24,7 @@ jobs:
             os: 'ubuntu-latest'
             version-type: 'strict'
           - otp-version: '25.2'
-            elixir-version: '1.14.3'
+            elixir-version: '1.14.2'
             os: 'ubuntu-latest'
           - otp-version: '25.2'
             elixir-version: '1.14.3'
@@ -66,14 +66,6 @@ jobs:
             otp-version: '21'
             rebar3-version: '3.12'
             os: 'ubuntu-20.04'
-          - elixir-version: 'v1.6'
-            otp-version: '21'
-            rebar3-version: '3.12'
-            os: 'ubuntu-20.04'
-          - elixir-version: 'v1.7'
-            otp-version: '22'
-            rebar3-version: '3.13'
-            os: 'ubuntu-20.04'
           - elixir-version: 'v1.7'
             otp-version: '22'
             rebar3-version: '3.13'
@@ -86,18 +78,10 @@ jobs:
             otp-version: '25.0.2'
             rebar3-version: '3.19'
             os: 'ubuntu-20.04'
-          - elixir-version: 'v1.10'
-            otp-version: '23'
-            rebar3-version: '3.14'
-            os: 'ubuntu-20.04'
           - elixir-version: 'v1.12'
             otp-version: '24'
             rebar3-version: '3.15'
             os: 'ubuntu-20.04'
-          - elixir-version: 'v1.13.4'
-            otp-version: '25.0.2'
-            rebar3-version: '3.19'
-            os: 'ubuntu-20.04'
           - elixir-version: 'v1.11.0'
             otp-version: '22.3.4.2'
             os: 'ubuntu-20.04'
@@ -108,11 +92,11 @@ jobs:
             version-type: 'strict'
           - elixir-version: 'main'
             otp-version: '23.1'
-            os:  'ubuntu-20.04'
+            os: 'ubuntu-20.04'
             version-type: 'strict'
           - elixir-version: 'main'
             otp-version: '25'
-            os:  'ubuntu-20.04'
+            os: 'ubuntu-20.04'
             version-type: 'strict'
           - gleam-version: '0.23'
             otp-version: '24'
@@ -126,7 +110,7 @@ jobs:
             otp-version: false
             os: 'ubuntu-latest'
             disable_problem_matchers: true
-          - gleam-version: '0.22.0' # Version with Gleam's old archive naming convention
+          - gleam-version: '0.22.0'  # Version with Gleam's old archive naming convention
             otp-version: '24'
             os: 'ubuntu-latest'
             disable_problem_matchers: true

README.md

@@ -88,6 +88,21 @@ jobs:
         ...
 ```
 
+### Outputs
+
+The action provides the following outputs:
+
+| Output             | Content
+|-                   |-
+| otp-version        | The Erlang version, e.g. `OTP-26.0`
+| elixir-version     | The Elixir version, e.g. `v1.14-otp-26`
+| gleam-version      | The Gleam version, e.g. `v0.23.0`
+| rebar3-version     | The `rebar3` version, e.g. `3.18.0`
+| setup-beam-version | The commit unique id of the executed action version, e.g. `a34c98f`
+
+accessible as `${{steps.<setup-beam-step-id>.outputs.<Output>}}`,
+e.g. `${{steps.setup-beam.outputs.erlang-version}}`
+
 ### Version file
 
 A version file is specified via input `version-file` (e.g.`.tool-versions`). This

action.yml

@@ -58,6 +58,8 @@ outputs:
     description: Exact version of Gleam that was installed
   rebar3-version:
     description: Exact version of rebar3 that was installed
+  setup-beam-version:
+    description: The commit unique id of the execution action version
 runs:
   using: node16
   main: dist/index.js

dist/index.js

@@ -9868,6 +9868,10 @@ async function main() {
 
   await maybeInstallGleam(gleamSpec)
   await maybeInstallRebar3(rebar3Spec)
+
+  // undefined is replaced by a function, post- main branch merge
+  const setupBeamVersion = 'undefined'
+  core.setOutput('setup-beam-version', setupBeamVersion)
 }
 
 async function installOTP(otpSpec, osVersion) {

src/setup-beam.js

@@ -47,6 +47,10 @@ async function main() {
 
   await maybeInstallGleam(gleamSpec)
   await maybeInstallRebar3(rebar3Spec)
+
+  // undefined is replaced by a function, post- main branch merge
+  const setupBeamVersion = 'undefined'
+  core.setOutput('setup-beam-version', setupBeamVersion)
 }
 
 async function installOTP(otpSpec, osVersion) {