fix(docker): bump .go-version to 1.24.6

[dsotirakis]

What happened:

This PR most likely broke the latest version of the action. See the logs below for more info.

Logs

Run ./.github/actions/actions-oidc-debugger
  with:
    audience: https://github.com/grafana
Building docker image
  Dockerfile for action: '/home/runner/work/dsotirakis-test-repo/dsotirakis-test-repo/./.github/actions/actions-oidc-debugger/Dockerfile'.
  /usr/bin/docker build -t ac8f72:49d04ed9ee2a4845a5ebd303b1e5f8ff -f "/home/runner/work/dsotirakis-test-repo/dsotirakis-test-repo/./.github/actions/actions-oidc-debugger/Dockerfile" "/home/runner/work/dsotirakis-test-repo/dsotirakis-test-repo/.github/actions/actions-oidc-debugger"
  #0 building with "default" instance using docker driver
  
  #1 [internal] load build definition from Dockerfile
  #1 transferring dockerfile: 250B done
  #1 DONE 0.0s
  
  #2 [internal] load metadata for docker.io/library/alpine:3.22.1@sha256:4bcff63911fcb4448bd4fdacec207030997caf25e9bea4045fa6c8c44de311d1
  #2 ...
  
  #3 [auth] library/alpine:pull token for registry-1.docker.io
  #3 DONE 0.0s
  
  #2 [internal] load metadata for docker.io/library/alpine:3.22.1@sha256:4bcff63911fcb4448bd4fdacec207030997caf25e9bea4045fa6c8c44de311d1
  #2 DONE 1.0s
  
  #4 [internal] load .dockerignore
  #4 transferring context: 138B done
  #4 DONE 0.0s
  
  #5 [internal] load build context
  #5 transferring context: 99.33kB done
  #5 DONE 0.0s
  
  #6 [1/4] FROM docker.io/library/alpine:3.22.1@sha256:4bcff63911fcb4448bd4fdacec207030997caf25e9bea4045fa6c8c44de311d1
  #6 resolve docker.io/library/alpine:3.22.1@sha256:4bcff63911fcb4448bd4fdacec207030997caf25e9bea4045fa6c8c44de311d1 0.0s done
  #6 sha256:4bcff63911fcb4448bd4fdacec207030997caf25e9bea4045fa6c8c44de311d1 9.22kB / 9.22kB done
  #6 sha256:eafc1edb577d2e9b458664a15f23ea1c370214193226069eb22921169fc7e43f 1.02kB / 1.02kB done
  #6 sha256:9234e8fb04c47cfe0f49931e4ac7eb76fa904e33b7f8576aec0501c085f02516 581B / 581B done
  #6 sha256:9824c27679d3b27c5e1cb00a73adb6f4f8d556994111c12db3c5d61a0c843df8 0B / 3.80MB 0.1s
  #6 sha256:9824c27679d3b27c5e1cb00a73adb6f4f8d556994111c12db3c5d61a0c843df8 3.80MB / 3.80MB 0.1s done
  #6 extracting sha256:9824c27679d3b27c5e1cb00a73adb6f4f8d556994111c12db3c5d61a0c843df8
  #6 extracting sha256:9824c27679d3b27c5e1cb00a73adb6f4f8d556994111c12db3c5d61a0c843df8 0.1s done
  #6 DONE 0.3s
  
  #7 [2/4] COPY .go-version .go-version
  #7 DONE 0.0s
  
  #8 [3/4] RUN apk add --no-cache go=$(cat .go-version)-r0
  #8 0.171 fetch https://dl-cdn.alpinelinux.org/alpine/v3.22/main/x86_64/APKINDEX.tar.gz
  #8 0.242 fetch https://dl-cdn.alpinelinux.org/alpine/v3.22/community/x86_64/APKINDEX.tar.gz
  #8 0.583 ERROR: unable to select packages:
  #8 0.587   go-1.24.6-r0:
  #8 0.587     breaks: world[go=1.24.4-r0]
  #8 ERROR: process "/bin/sh -c apk add --no-cache go=$(cat .go-version)-r0" did not complete successfully: exit code: 1
  ------
   > [3/4] RUN apk add --no-cache go=$(cat .go-version)-r0:
  0.171 fetch https://dl-cdn.alpinelinux.org/alpine/v3.22/main/x86_64/APKINDEX.tar.gz
  0.242 fetch https://dl-cdn.alpinelinux.org/alpine/v3.22/community/x86_64/APKINDEX.tar.gz
  0.583 ERROR: unable to select packages:
  0.587   go-1.24.6-r0:
  0.587     breaks: world[go=1.24.4-r0]
  ------
  Dockerfile:5
  --------------------
     3 |     COPY .go-version .go-version
     4 |     
     5 | >>> RUN apk add --no-cache go=$(cat .go-version)-r0
     6 |     
     7 |     COPY . .
  --------------------
  ERROR: failed to build: failed to solve: process "/bin/sh -c apk add --no-cache go=$(cat .go-version)-r0" did not complete successfully: exit code: 1

.go-version wasn't updated correctly and caused the latest version of this action to break.

Expected behavior

Running docker build . should build the image without issues. After the fix, the image is being built without issues.

Fixes: #30

[dsotirakis]

also - optional but the base image can be updated to: alpine:3.22.1@sha256:4bcff63911fcb4448bd4fdacec207030997caf25e9bea4045fa6c8c44de311d1. please let me know if you'd like me to add this change as part of the current PR.

[dsotirakis]

@nobe4 / @GrantBirki 👋
Any chance we can get this one merged soon? Thanks a lot!

[GrantBirki]

👋 Thanks @dsotirakis for opening this PR! It seems that something about this PR being a fork has CI complaining. I have opened the same changes in this PR -> #32