remove support for spack 0.21

.github/workflows/dev.yml

@@ -12,7 +12,7 @@ jobs:
       matrix:
         ref:
         - develop
-        - releases/v0.21
+        - releases/v0.23
     steps:
     - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633
 
@@ -38,15 +38,6 @@ jobs:
         python3 -c 'print("hello world")'
       if: matrix.ref == 'develop'
 
-    - name: Check build cache install in active env with spack-bash shell (old style)
-      shell: spack-bash {0}
-      run: |
-        spack env activate
-        spack install --add --cache-only --reuse --no-check-signature python
-        which python3
-        python3 -c 'print("hello world")'
-      if: matrix.ref == 'releases/v0.21'
-
     - name: Check spack-sh shell
       shell: spack-sh {0}
       run: |

README.md

@@ -13,7 +13,7 @@ jobs:
     - name: Set up Spack
       uses: spack/setup-spack@v2
       with:
-        ref: develop      # Spack version (examples: develop, releases/v0.21)
+        ref: develop      # Spack version (examples: develop, releases/v0.23)
         buildcache: true  # Configure oci://ghcr.io/spack/github-actions-buildcache
         color: true       # Force color output (SPACK_COLOR=always)
         path: spack       # Where to clone Spack
@@ -23,15 +23,6 @@ jobs:
 When `buildcache: true` is set, binaries from https://github.com/spack/github-actions-buildcache
 are used. For available software, [see here](https://github.com/spack/github-actions-buildcache/blob/main/spack.yaml).
 
-**Note**: when using the build cache with Spack v0.21 and below, the following flag is
-required:
-
-```
-spack install --no-check-signature
-```
-
-This flag is no longer required in Spack v0.22.
-
 ## Example: shell support
 
 If you want to use shell-aware commands such as `spack env activate` and `spack load`,

action.yml

@@ -6,7 +6,7 @@ branding:
   color: "blue"
 inputs:
   ref:
-    description: "Version of Spack (git ref: develop, releases/v0.21, ...)"
+    description: "Version of Spack (git ref: develop, releases/v0.23, ...)"
     required: false
     default: develop
   buildcache:
@@ -41,9 +41,7 @@ runs:
   - name: Spack configuration
     run: |
       if [ ${{ inputs.buildcache }} = "true" ]; then
-        # Spack 0.22 should support the --unsigned flag
-        spack mirror add --unsigned github-actions-buildcache oci://ghcr.io/spack/github-actions-buildcache || \
-        spack mirror add github-actions-buildcache oci://ghcr.io/spack/github-actions-buildcache
+        spack mirror add --unsigned github-actions-buildcache oci://ghcr.io/spack/github-actions-buildcache
       fi
     shell: sh